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Node.js tutorial in Visual Studio Code

Node.js is a platform for building fast and scalable server applications using JavaScript. Node.js is the runtime and npm is the Package Manager for Node.js modules.

Visual Studio Code has support for the JavaScript and TypeScript languages out-of-the-box as well as Node.js debugging. However, to run a Node.js application, you will need to install the Node.js runtime on your machine.

To get started in this walkthrough, install Node.js for your platform . The Node Package Manager is included in the Node.js distribution. You'll need to open a new terminal (command prompt) for the node and npm command-line tools to be on your PATH.

To test that you have Node.js installed correctly on your computer, open a new terminal and type node --version and you should see the current Node.js version installed.

Linux : There are specific Node.js packages available for the various flavors of Linux. See Installing Node.js via package manager to find the Node.js package and installation instructions tailored to your version of Linux.
Windows Subsystem for Linux : If you are on Windows, WSL is a great way to do Node.js development. You can run Linux distributions on Windows and install Node.js into the Linux environment. When coupled with the WSL extension, you get full VS Code editing and debugging support while running in the context of WSL. To learn more, go to Developing in WSL or try the Working in WSL tutorial.

Hello World

Let's get started by creating the simplest Node.js application, "Hello World".

Create an empty folder called "hello", navigate into and open VS Code:

Tip: You can open files or folders directly from the command line. The period '.' refers to the current folder, therefore VS Code will start and open the Hello folder.

From the File Explorer toolbar, press the New File button:

File Explorer New File

and name the file app.js :

File Explorer app.js

By using the .js file extension, VS Code interprets this file as JavaScript and will evaluate the contents with the JavaScript language service. Refer to the VS Code JavaScript language topic to learn more about JavaScript support.

Create a simple string variable in app.js and send the contents of the string to the console:

Note that when you typed console. IntelliSense on the console object was automatically presented to you.

console IntelliSense

Also notice that VS Code knows that msg is a string based on the initialization to 'Hello World' . If you type msg. you'll see IntelliSense showing all of the string functions available on msg .

string IntelliSense

After experimenting with IntelliSense, revert any extra changes from the source code example above and save the file ( ⌘S (Windows, Linux Ctrl+S ) ).

Running Hello World

It's simple to run app.js with Node.js. From a terminal, just type:

You should see "Hello World" output to the terminal and then Node.js returns.

Integrated Terminal

VS Code has an integrated terminal which you can use to run shell commands. You can run Node.js directly from there and avoid switching out of VS Code while running command-line tools.

View > Terminal ( ⌃` (Windows, Linux Ctrl+` ) with the backtick character) will open the integrated terminal and you can run node app.js there:

integrated terminal

For this walkthrough, you can use either an external terminal or the VS Code integrated terminal for running the command-line tools.

Debugging Hello World

As mentioned in the introduction, VS Code ships with a debugger for Node.js applications. Let's try debugging our simple Hello World application.

To set a breakpoint in app.js , put the editor cursor on the first line and press F9 or click in the editor left gutter next to the line numbers. A red circle will appear in the gutter.

app.js breakpoint set

To start debugging, select the Run and Debug view in the Activity Bar:

Run icon

You can now click Debug toolbar green arrow or press F5 to launch and debug "Hello World". Your breakpoint will be hit and you can view and step through the simple application. Notice that VS Code displays a different colored Status Bar to indicate it is in Debug mode and the DEBUG CONSOLE is displayed.

hello world debugging

Now that you've seen VS Code in action with "Hello World", the next section shows using VS Code with a full-stack Node.js web app.

Note: We're done with the "Hello World" example so navigate out of that folder before you create an Express app. You can delete the "Hello" folder if you want as it is not required for the rest of the walkthrough.

An Express application

Express is a very popular application framework for building and running Node.js applications. You can scaffold (create) a new Express application using the Express Generator tool. The Express Generator is shipped as an npm module and installed by using the npm command-line tool npm .

Tip: To test that you've got npm correctly installed on your computer, type npm --help from a terminal and you should see the usage documentation.

Install the Express Generator by running the following from a terminal:

The -g switch installs the Express Generator globally on your machine so you can run it from anywhere.

We can now scaffold a new Express application called myExpressApp by running:

This creates a new folder called myExpressApp with the contents of your application. The --view pug parameters tell the generator to use the pug template engine.

To install all of the application's dependencies (again shipped as npm modules), go to the new folder and execute npm install :

At this point, we should test that our application runs. The generated Express application has a package.json file which includes a start script to run node ./bin/www . This will start the Node.js application running.

From a terminal in the Express application folder, run:

The Node.js web server will start and you can browse to http://localhost:3000 to see the running application.

Your first Node Express App

Great code editing

Close the browser and from a terminal in the myExpressApp folder, stop the Node.js server by pressing CTRL+C .

Now launch VS Code:

Note: If you've been using the VS Code integrated terminal to install the Express generator and scaffold the app, you can open the myExpressApp folder from your running VS Code instance with the File > Open Folder command.

The Node.js and Express documentation does a great job explaining how to build rich applications using the platform and framework. Visual Studio Code will make you more productive in developing these types of applications by providing great code editing and navigation experiences.

Open the file app.js and hover over the Node.js global object __dirname . Notice how VS Code understands that __dirname is a string. Even more interesting, you can get full IntelliSense against the Node.js framework. For example, you can require http and get full IntelliSense against the http class as you type in Visual Studio Code.

http IntelliSense

VS Code uses TypeScript type declaration (typings) files (for example node.d.ts ) to provide metadata to VS Code about the JavaScript based frameworks you are consuming in your application. Type declaration files are written in TypeScript so they can express the data types of parameters and functions, allowing VS Code to provide a rich IntelliSense experience. Thanks to a feature called Automatic Type Acquisition , you do not have to worry about downloading these type declaration files, VS Code will install them automatically for you.

You can also write code that references modules in other files. For example, in app.js we require the ./routes/index module, which exports an Express.Router class. If you bring up IntelliSense on index , you can see the shape of the Router class.

Express.Router IntelliSense

Debug your Express app

You will need to create a debugger configuration file launch.json for your Express application. Click on Run and Debug in the Activity Bar ( ⇧⌘D (Windows, Linux Ctrl+Shift+D ) ) and then select the create a launch.json file link to create a default launch.json file. Select the Node.js environment by ensuring that the type property in configurations is set to "node" . When the file is first created, VS Code will look in package.json for a start script and will use that value as the program (which in this case is "${workspaceFolder}\\bin\\www ) for the Launch Program configuration.

Save the new file and make sure Launch Program is selected in the configuration dropdown at the top of the Run and Debug view. Open app.js and set a breakpoint near the top of the file where the Express app object is created by clicking in the gutter to the left of the line number. Press F5 to start debugging the application. VS Code will start the server in a new terminal and hit the breakpoint we set. From there you can inspect variables, create watches, and step through your code.

Debug session

Deploy your application

If you'd like to learn how to deploy your web application, check out the Deploying Applications to Azure tutorials where we show how to run your website in Azure.

There is much more to explore with Visual Studio Code, please try the following topics:

Node.js Tutorial

Node.js mysql, node.js mongodb, raspberry pi, node.js reference, node.js editor.

Node.js is an open source server environment.

Node.js allows you to run JavaScript on the server.

Learning by Examples

Our "Show Node.js" tool makes it easy to learn Node.js, it shows both the code and the result.

Click on the "Run example" button to see how it works.

Examples Running in the Command Line Interface

In this tutorial there will be some examples that are better explained by displaying the result in the command line interface.

When this happens, The "Show Node.js" tool will show the result in a black screen on the right:

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9 Best Examples of Node.js Apps to Inspire Your Next Project

Node.js is used by world-class companies and ambitious startups. Want to find out more about why companies choose Node.js for their backend? Find some inspiration in our new list.

9 Best Examples of Node.js Apps to Inspire Your Next Project

Fast, simple, easy, powerful, and flexible - these are the words developers use to describe Node.js apps. This technology is internationally popular because it can solve both current and predicted business and user needs. That is why world-leading companies are using Node.js - and you also have a chance to develop a market-dominating project with its help.

In this article, we have collected a list of the most prominent apps powered by Node.js and described what business problems can be solved with its help.

Main types of apps to build with Node.js

One of the main features of Node.js is its event-driven approach. The growing popularity of interactive applications, social networks, and teamwork solutions led to the growing popularity of Node.js. Here is what you can create with it.

Single-page applications

The single-page app (SPA) is a lightweight web application that consists of one page only. For example, Gmail or Twitter are SPAs. All the content is downloaded upon initial load, that's why it takes a bit longer than usual. However, this enables the app to respond instantly to all user actions - there's no more need to connect to the server.

This is how Gmail and Twitter work.

Single-page applications adjust to any platform and any screen size. Besides, they can also work offline.

SPAs are usually running on JavaScript: Angular, React, or Vue framework on frontend and Node.js on backend.

Real-time applications

The essence of real-time applications is clear from the name - this is an application that instantly responds to a user action, for example, chats or games.

Node.js is scalable, and it allows handling a large number of real-time users. The main advantage of Node.js is its asynchrony, combined with an event approach. The ability to perform several requests simultaneously makes Node.js a perfect choice for real-time apps.

Node.js application for IoT devices

Why are IoT applications so special? Due to a huge amount of data constantly generated by connected sensors, engines, cameras, such an application should be able to process and store. Node.js is suitable for data-intensive apps with large real-time traffic.

Location-based apps powered by Node.js

In 2023, most of the popular applications provide location-based services. And a huge number of them is also developed using Node.js. Asynchrony and the ability to provide real-time updates are the main advantages of Node.js for this type of application.

Node.js streaming application

Node.js can easily handle real-time data streams, which is the main idea of streaming applications. Moreover, Node.js can provide quick data synchronization between the server and the client. As a result, users get an improved experience because of a minimized delay.

What is more, it is possible to combine the best features of Node.js in one application. For example, knowing that this platform is ideal for the Internet of things, streaming, and real-time applications, it is possible to use it to create drone-streaming Node.js app examples.

Best Node.js Projects With World-Famous Names

Each of the Node.js App Examples we are going to list employed one of the best Node.js qualities - and got measurable and positive results.

Trendsetting apps use Node.js for the obvious reasons - it's the ability to withstand great loads and serve a large number of users. Isn't it what the industry leaders expect?

Groupon - 50% reduction in page loading time

Groupon is a kind of aggregator that collects discounts for different goods and services in one place. Initially, it based on Ruby on Rails. After a few acquisitions, PHP and Java were added to the stack. The product was growing, and it became hard to maintain. Groupon was looking for a solution to unify all services with a single technology. And Node.js seemed to be the right choice.

The migration process took almost a year. Today, this is a platform with 50% faster page loads since a single server processes all operations. Also, Node.js made the web app more stable : before the migration, Groupon released an attractive Starbucks deal, it was so popular that the website went down. This never happened to a Node.js powered Groupon website, even though there were more popular deals offered.

Twitter Lite - speedy and powerful progressive web application

Twitter has a goal - to reach every person on the planet, but slow, unreliable, or expensive Internet connection in many regions made this goal hard to achieve. But then the solution was found: Twitter Lite - a progressive web application .

A PWA with React on frontend and Node.js on backend made Twitter accessible for everyone: the app works in any browser on any device (no restrictions to just Android and iOS smartphones). The Service Worker caches the content and makes app usage possible even when the connection is lost. Once the Internet is available again, new content is downloaded and stored in the cache.

The creators managed to make the application lighter but, at the same time, powerful. The initial app load takes up to 5 seconds in slow 3G networks, and this is also a great result.

GoDaddy - 10x fewer servers

GoDaddy is one of the largest web hosting companies worldwide. Currently, it has over 77 million registered domains , which is around 20% of the world's total. Just imagine the number of visitors, GoDaddy has to serve daily.

The service was initially powered by .Net, which limits you to monolithic architecture. Looking for ways to switch to modularity, the GoDaddy team has chosen Node.js - a technology supported by a strong community of module publishers.

Currently, almost the whole team consists of full-stack JavaScript developers who can work both on frontend and backend. Also, the transition to microservices architecture enabled to reduce the deployment time to under one minute. Vibrant result!

Also, in 2016, the GoDaddy Website Builder platform was ported to Node.js. One of the changes was the migration to the Cassandra database. As a result, the number of servers required to host the websites reduced by 10 times .

We analyze the pros and cons of this process for your project and create a custom roadmap for transfer for free

Uber - One of the first 3 companies to use Node.js in the development

Uber was one of the first companies in innovative taxi services - and one of the first who used Node.js in production. The main reason for this choice was the already mentioned asynchrony, the ability to process large amounts of data almost instantly, clean code, and the cost to implement it.

What is more, the essence of this app is the driver-passenger matching system. They needed the event-driven environment, short but powerful code, and the ability to withstand huge loads. These are the features Node.js can offer simultaneously. For now, Uber can withstand 2 million real-time calls per second .

Sharing JavaScript on frontend and backend made it possible to build a universal (isomorphic) web application for Uber users.

LinkedIn - Node-based server-side of their mobile app

LinkedIn does not need any introductions. As most of the apps from this list, they faced the rising number of mobile users and decided to update the mobile server with Node.js (previously, it based on Ruby-on-Rails). As a result, the new LinkedIn mobile app can handle twice as much traffic with just four instances, instead of 15 required before the migration.

Another requirement for the mobile application was seamless work with the platform API and database. In terms of performance, Node.js outplayed the former Ruby on Rails backend.

Trello - Simple Agile interface at fingertips

Trello is now one of the most popular project management tools for Agile teams. Its intuitive interface and real-time changes in task management attract companies from a variety of industries as well as individuals. Node.js is the core technology for Trello from day one. Initially, the team was about to build a single-page application prototype and chose Node.js due to the fast development process and code reusability.

But Node.js could handle more complex tasks as well. Trello's functionality looks simple for the user, but there are tons of work handled by the server. Also important are the real-time updates - a feature that is perfectly implemented with the help of Node.js event-driven approach.

Netflix - transfer from a monolith app to distributed instances

When you hear the word "streaming," you most likely think of Netflix. This company went from a DVD shop to the world's largest streaming service and its own production. How do they serve millions of users simultaneously?

With a sleek combination of Java and Node.js on the backend . All APIs for different platforms (including iOS and Android, desktop operating systems, and various TV platforms) were previously run by a monolith Groovy app. Node.js enabled to build restify instances and run them in separate Docker containers. As a result, the apps are faster and more scalable with better versioning. The development time was also greatly reduced.

PayPal - 200ms faster-served pages

PayPal's journey to Node.js started with an experiment : two backend teams had to develop the same app prototype. The Java team consisted of 5 developers, whereas in the team Node.js were only two developers. Surprisingly, the Node team outplayed the competitor and has proven that this technology enables faster development. This is how Node.js became a part of PayPal's core stack.

As a result, PayPal is capable of processing twice as many user requests per second, and the response from the page has 34% faster, which is 200 ms on average. PayPal payment system is also on the list of the most used financial applications for iPhone, and at the moment, it serves 286 million financial accounts worldwide.

Node.js Application Developed by Clockwise

The great potential of technology does not mean that only giant corporations can use it for development. What is more, startups often hire  Node.js development company  to build a scalable application in short terms. This technology is also perfectly suitable for small and medium-sized businesses. And here is a Node.js app example created by our team.

Fleet Management Software

This platform began as software that connects waste truck drivers and dispatchers . At the moment, this is a multifunctional mobile application that can be used by any company that coordinates transport and people.

This is exactly the case when an application benefits from several Node.js benefits at once.

Before application development, drivers and dispatchers used phone calls or face-to-face meetings for communication. This reduced efficiency and increased the likelihood of mistakes. With the fleet management app, all the procedures are automated: drivers get instant notifications when dispatchers make changes to order status, and all work processes are easily tracked.

This is a problem similar to that of Groupon or PayPal - and Node.js brought a perfect solution. In our app, we managed to reduce the load time from 5 to 1.5 seconds.

Technical Reasons Why Startups Choose Node.js

We have already discussed the most prominent Node.js app examples and showed that this technology is able to solve various business tasks - from development time reduction to improved user experience. However, there are some more reasons to choose it.

Node.js is just the case when you do not need to reinvent the wheel. Consequently, it increases development speed, and less code needs to be created. What is more, the Node.js web application development cycle can be optimized even better with the help of tools and technologies available inside the Node Package Manager (NPM).


PayPal and Netflix use this approach. Node.js is perfectly suitable for microservices architecture development because it perfectly fits the event-driven I/O model.

In practice, this means that each user request is addressed to a certain part of an app and gets a response directly from it.

Comparison of microservices vs. monolith architecture

Faster development process

When compared to its closes rival Java, Node.js as a core backend technology has clear benefits :

Node.js is capable of giving you more than you expect. If you are planning to create an interactive application that could potentially have a broad target audience, a large number of queries, and dynamic data, then Node.js would be the right choice.

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Exploring The Best Node.js Application Examples For Big Enterprise

Chief Technical Officer Chintan Gor

Node.js has become the most preferable software technology for various IT companies all across the world. This is because it offers lots of solutions to its users. Today, we will talk about Node.js Application Examples.

So if you have some innovative ideas in your mind and you are in search of a set of technologies where you can let your dreams become a reality, then Node.js can be a great option.

Node.js is used by all the leading tech companies such as IBM, Microsoft, PayPal for emphasizing speed, intensive reports, and concurrency.

It also helped many Professional Nodejs Development Company in developing video apps, social media apps, real-time data tracking, etc.

JavaScript deals only with the front end side, but Node.js is associated with the back end side as well, hence the productivity and the development of both the sides boost remarkably. Now, before discussing the Node.js Application Example, let’s first understand about it.

Why Do Organizations Use Node.js?

Before the advent of Node.js, developers used to face lots of problems for using various technologies for the client and server-side scripting. Traditionally, JavaScript is a language used for front end designing with HTML along with effective features.

After the invention of Node.js, server-side scripting was introduced, which can communicate easily with a distributed server. These are some Facts About The Node JS Development that one should be aware of.

One of the biggest milestones of discovery is that it can initiate entire dynamic web solutions before returning to the browser.

Node.js was developed by Ryan Dahl in the year 2009 and it is basically an open-source and server-side platform that is designed on the JavaScript V8 engine of Chrome.

Benefits of Node.js

There are so many benefits of Node.js. However, the following points will justify how Node.js can be beneficial to your company:

Top 29 Node.js App Example

PayPal is one of the famous online payment platforms in the world which is successfully built on Node.js. The platform has more than 200 million active users now.

The company has drastically transformed the traditional methods of making payments through cheques or demand draft to online money transfer service in no time.

PayPal always makes sure to maintain its users safety while making the transaction not only within the country but also abroad.

Additionally, it also offers other exciting features such as free shopping services as well as buyer protection.

Problems faced by PayPal

Benefits after using Node.js

Netflix is one of the popular video streaming services widely known all across the world. It is one of the best Node.js Application Examples.

There are more than 182 million active subscribers in 190 countries who spend 100 million hours a day by watching 5500 titles.

Netflix is one of the best Node JS examples as it has done tremendous improvements after initiating Node js.

Problems faced by Netflix

Uber is a popular platform which offers taxi cab, bike rides, bicycle sharing, food delivery and other transportation services to its customers. This Node.js Application Example has been built through various Node.js tools as well as programming languages.

Uber has continuously worked on its mobile app by introducing new technologies for enhancing overall business efficiency. Not only this, but it has increased its size after every 6 months since 2 years because of which data processing capacity of Node.js has become the best solution.

Node.js is the primary feature of their operations because it helps to scale up the resources as per the rising demand of the cab services in a simplistic manner. Uber mentioned three prime reasons for using Node.js:

Problems faced by Uber


Uber is successfully processing more than 2 million remote procedure calls per second even in high traffic which is very impressive.

It is a platform where you can showcase your expertise and further interact with the community members through groups or brand pages. LinkedIn helps to expand your business connections.

The platform allows the recruiters to post a job vacancy where job seekers can upload their resumes. Moreover, the people who are planning to hire you on LinkedIn can look at your profile.

In the year 2016, Microsoft purchased the service for a whopping $26 billion. The back end of LinkedIn is developed on Node.js. The main reason behind switching on to the Node.js is performance and efficiency.

Problems faced by LinkedIn

Needless to say, eBay is one of the biggest multinational e-commerce platforms which has always adopted new technologies for better user experience.

The platform has huge traffic because of which the eBay developers were in search of high intensity and real-time apps which  can handle a large number of traffic.

Problems faced by eBay

The developers were also in search of a service that could help organize a large number of eBay services to show all the information on the page.

After a lot of meetings and discussions, the eBay engineers decided to choose Node.js as it can fulfil all their requirements.

You can build a high-end eCommerce Web Application with Node.js . It will be a perfect combination.

Being the largest retail chain in the world, Walmart is sincerely diving into the e-commerce space. The main aim of the company is to go online and it is supported by Node.js.

Walmart decided to go with this new trend and has taken up the risk of engaging itself with a newer technology instead of just trying and testing frameworks.

Problems faced by Walmart

The releasing time has been decreased and the response time has become much faster.

Following are the new technologies which the company started using after adopting Node .js:

A well known online content publishing service, Medium uses web solutions for the web servers. It is one of the best Node.js Application Examples.

As said above, Medium is one of the popular content-sharing platforms where one can read lots of articles. The data-driven platform helps in expanding togetherness of the users as per their behaviour.

Problems faced by Medium

NASA uses Node.js for its software which is of utmost importance. The main motive of NASA is to keep its astronauts safe and Node.js is solely based on that.

It is quite unexpected to see NASA in the list of Node.js Application Example. Isn’t it?

 Problems faced by NASA

Finally, NASA engineers planned to develop an end-to-end data system and adopted Node.js. NASA decided to move all its data that are related to the EVA spacesuits to a cloud-based database to decrease the access timelines.


Benefits after using Node js

Mozilla is the most widely used web browser available for OS X, Windows, Firefox OS and Android in 80 different languages. And it is also one of the best Node JS Application Examples.

 Problems faced by Mozilla

The web browser uses Node JS in various web projects such as Mozilla Persona and BrowserID.

A popular project management application, Trello was developed in the year 2011 that has got many users all around the world.

The web server of Trello was developed by Node JS and the main reason behind this is the huge demand for open connection support.

Chat Applications are one of the most popular Node JS Use Cases of all time.

Problems faced by Trello

Established in the year 2008, Groupon is an e-commerce giant which helps in connecting its subscribers with the local business by providing various services across 15 different countries. The company has made successful presence worldwide now.

Groupon developers always make sure to work on the application development more swiftly. However, they faced some issues regarding the management of various stacks for each set up when the company has made its presence worldwide.

Due to this, Groupon finally decided to shift to Node js.

Groupon is one of the popular virtual marketplaces especially for online deals as well as coupons. It is one of the widely utilized Node JS Application Example.

Problems faced by Groupon

Being one of the popular social media networks, Twitter can be another Node JS Application Example. The platform lets you share your thoughts and communicate with others through posts and messages which are also known as Tweets.

Twitter is one of the best platforms to increase your brand value based on the targeted audience. All you need to do is plan a strong social media marketing strategy and you are good to go.

Problems faced by Twitter

The next brand in Node.JS projects is Yahoo. As we all know, Yahoo is one of the famous web service providers. The platform also uses Node.js in front end development.

Yahoo Search, as well as Yahoo web portal, are its own search engines which provide many services such as Yahoo Finance, Yahoo News and Yahoo Mail.

Problems faced by Yahoo

GoDaddy is one of the largest domain registrar and web hosting companies which has expanded its business worldwide.

Problems faced by GoDaddy

Next Node.js App in our list is Airbnb which is a hospitality service provider. You can access its service through its apps or website.

Airbnb offers travel services to its customers all across the world.

Problems faced by Airbnb

American Express

The start-up companies usually prefer to adopt the latest technologies like Node. js. American Express did the same. The well-known financial service organization focuses on adopting the best technological practice on its official website.

Problems faced by American Express


It’s great to see such a well-established organization giving priority to customer security and user experience.

Being a fintech start-up, RightArm operates for the people of India as well as Singapore. On this web application, people can send and receive various resources such as goods and services, skills, goodwill, money, etc.

It offers client services like managing projects and tasks. Parties can collaborate through both free and paid ways.

The company uses Node.js Packages for its software bundle which also includes Angular, MongoDB as well as Express.js.

Problems faced by RightArm

Admission Desk

Next Node JS Application Example is the Admission Desk. It is basically an app developed for the learners who are in search of studies online. People can find various courses, educational institutions as well as other additional information.

With The help of this platform, one can apply for the courses and take admissions in institutions. This is the reason that the developers of the company preferred to use Node.js along with other technologies like Express.js, Angular, PhoneGap, etc.

Problems faced by Admission Desk

CuePath Innovation

CuePath Innovation is one of the Node.js Example Applications related to healthcare. The platform basically provides loT project tools for tracking the use of medicines.

In Fact, Node JS For IoT is a dream combination , without a pinch of a doubt.!

There are three elements for different parties:

Problems faced by CuePath Innovation

KGK is a well-known international jewellery retailer. The developers of KGK have adopted Node.js, MongoDB as well as AngularJS.

Problems faced by KGK

JustPay is an online or digital payment platform like Google Pay. This is another reputed fintech startup Node.js Example Application. Their well-known product named Express Checkout is basically a payment gateway which ensures secured payment to its customers.

The dashboard of JustPay uses Node.js to implement an analytics engine for showing user metrics.

Problems faced by JustPay

 Benefits after using Node.js

SkyCatch is one of the best Node.js examples for loT development. The system helps to capture high-quality pictures through drones in the construction sites and further examines and exports various data. It designs and operates with the customized maps and 3D models as well.

Problems faced by Skycatch

Connected Boat

Connected Boat is another example of Node.js Sample Apps which is solely developed for fleet owners, ensuring the protection of boats.

Problems faced by Connected Boat:

Storify is a platform which allows its users to create timelines as well as stories through posts from various social media platforms like Facebook, Twitter, or YouTube.

Problems faced by Storify

Benefits after using Node.js:

Wall Street Journal

The Wall Street Journal used Node.js at the time of designing the Facebook reader application. But the result they got was outstanding as it met all their expectations.

Problems faced by Wall Street Journal

Finally, the developers decided to leverage Node.js and switch to new technology. They worked on ‘Wall Street Journal Real Time’ which then gave amazing results as per their expectations.

Capital One

Established in 1988, Capital One is a bank holding company situated in Virginia that provides auto loans, credit cards, saving accounts and other banking services. The company has decided to shift on advanced technology and that’s how Node.js was implemented.

Problems faced by Capital One

Initially, the company was covered by Java but after Node.js came to rescue, Capital One invested its time on prototyping and tried to implement various other modern technological approaches which have resulted in tremendous improvement in their website.

Another Node.js example in our article is CitiBank which is one of the biggest financial institutions in the world. The company has over 2.5 thousand branches in 19 countries.

Earlier, they used JavaScript to continue their website operations but then they decided to shift to Node.js along with Hapi.js. Hapi.js is a framework of Node.js.

Problems faced by CitiBank

Read also: Diving Deep Into Top 10 Node.js Performance Tips

Yandex is basically the Russian Google which used to operate on JavaScript. Let us put it this way, Yandex Money is an electronic payment mode based on Russia which uses React.js on its front-end and Node.js on its backend.

Problems faced by Yandex


Shutterstock provides paid photographs, vectors, illustrations as well as music to its customers. The company was established in the year 2012 and now it has the total capital value of $2bn.

They also use Node.js for simple and user-friendly website operations.

Problems faced by Shutterstock

Node.js is one of the finest run-time environment for building web applications. As we have seen through many real-time examples that Node.js helps you to get rid of Poor Performance, manage the Response Time accurately, allows you to handle large data, and make optimize the utilization of memory.

In addition to that, Node.js is also beneficial when you’re looking to increase productivity and speed. Also, the user experience is taken care of when you’re dealing with Node.js.

That’s why we strongly feel that you should know How To Hire NodeJS developers for building your next web applications. If you’re in a search of a good one, then feel free to Connect With Us.

Frequently Asked Questions

What are the applications of node.js.

There are a variety of applications of the Node.js framework. However, some of the most popular ones are as listed below:

Data Streaming Server-Side Proxy Big Data Analytics Wireless Connectivity System Monitoring Real-Time Data Single Page Application

Is Node.js Good For Enterprise Applications?

The simple answer to this question would be YES. Node.js is a powerful run-time environment for building enterprise applications. The non-blocking (asynchronous) model of Node.js makes it a great choice for enterprise apps.

Who Uses Node.js?

There are many well-known companies and applications around the globe that are making use of node.js. Some of the most popular ones are:

Paypal Netflix Uber LinkedIn eBay Walmart Medium NASA Mozilla Trello

Is Node.js Still Popular?

Oh.! YES. Node.js is still very much relevant in today’s market for building enterprise-level web applications. With time, Node.js has improved productivity and agility. So, it has been able to retain its popularity.

What Is The Reason Behind Popularity Of Node.js?

The main reason behind the popularity of Node.js is that it makes use of JavaScript as a programming language. Now, you all know that nowadays all web browsers use JavaScript. Therefore, Node.js fist perfectly in this case.

Is Node.js Utilised For Front-End or Back-End?

Node.js is not a Front-End or Back-End technology. It is basically a runtime environment. So, you can use it for both frontend and backend.

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####What is Node.js? Node.js is a server-side platform built on Google Chrome's JavaScript Engine (V8 Engine).

####Where to use Node.js

Installing Node.js

From Binaries: Download the Node.js Binaries from Official Download Page Go To Downloads page
sudo apt-get install -y nodejs```

Creating a Simple Node.js Application

Initializing a node.js application.

Make a New Folder for your Node.js Application and cd into that new folder using Terminal (CMD)

Initialize a Node.js Application using NPM package manager

Now you will be asked a series of questions. You need to answer according to your project.

name : Name of your project in lowercase version : Version of your project. description : Description about your Project entry point : Defines entry point for App. Usually index.js or server.js test command : Command to execute test suite git repository : Link of Git repo keywords : Keywords which describes your application best. author : Your Name license : License

Now you will be presented a generated package.json file to review.

Sample directory structure for node.js app.

example application node js

assets : Contains all client-side assets that require compilation css : Contains all your LESS/Stylus style-sheets js : Contains your client-side CoffeeScript/ES6 files dist : Contains all compiled server-side scripts LICENSE : License file package.json : file contains meta data about your app or module public : Contains your static files that are not handled by any compilers : Read Me file routes.js : Contains all routes server.js : Entry Point src : Contains all server-side scripts controller : Contains all Controllers middleware : Contains all middleware scripts model : Contains Models if test : Contains all unit testing scripts ( implemented using a testing-framework of your choice ) views : Contains all your express views ( pug,handlebars, ejs or any other templating engine )

Some Frameworks Available for Node.js

Some of the Databases that can be used as our app's backend

There are hundreds of NoSQL Databases available that can be integrated with Node.js. Finding one for your application type is your responsibility :p.

To Proceed with the sample app I'll choose Express.js and MongoDB

Installing Express.js

--save option will add express to package.json

Assuming MongoDB installed on your system If not follow this link

Installing MongoDB driver

We will be creating a simple user authentication system using passport.js

Add passport and passport-local dependencies to package.json

We need some other dependencies too.Finally your dependencies should look like this

Now we need to choose a templating engine for our Node.js app

Few Popular Choices will be

Handlebars EJS Pug dust.js Mustache.js

Personally I would go for Handlebars. Because it is similar to HTML. It is upto you to choose a Templating engine. I recommend you to go through each of these templating engines and choose one that suits you.

Or you can use AngularJS , ReactJS or Something like VueJS for the frontend

Some Additional Modules used in Sample Application

Let's get down to Business

First we need to define a User model for our application using Mongoose. ( or not use Mongoose at all. Read more about this issue )

I have implemented only local registration part. you can refer passport.js website to know more about social media logins.

Now we can implement passport.js login and signup strategies

Routes will look like this

Our Application's Entry Point Server.js will look like this

example application node js

You can find the source to this Sample Application Here ### GITHUB REPOSITORY

Guide to setup

Now you can build your app on top of this sample application

Introduction to Node.js

Getting started guide to Node.js, the server-side JavaScript runtime environment. Node.js is built on top of the Google Chrome V8 JavaScript engine, and it's mainly used to create web servers - but it's not limited to just that.

More Examples

Node.js is an open-source and cross-platform JavaScript runtime environment. It is a popular tool for almost any kind of project!

Node.js runs the V8 JavaScript engine, the core of Google Chrome, outside of the browser. This allows Node.js to be very performant.

A Node.js app runs in a single process, without creating a new thread for every request. Node.js provides a set of asynchronous I/O primitives in its standard library that prevent JavaScript code from blocking and generally, libraries in Node.js are written using non-blocking paradigms, making blocking behavior the exception rather than the norm.

When Node.js performs an I/O operation, like reading from the network, accessing a database or the filesystem, instead of blocking the thread and wasting CPU cycles waiting, Node.js will resume the operations when the response comes back.

This allows Node.js to handle thousands of concurrent connections with a single server without introducing the burden of managing thread concurrency, which could be a significant source of bugs.

Node.js has a unique advantage because millions of frontend developers that write JavaScript for the browser are now able to write the server-side code in addition to the client-side code without the need to learn a completely different language.

In Node.js the new ECMAScript standards can be used without problems, as you don't have to wait for all your users to update their browsers - you are in charge of deciding which ECMAScript version to use by changing the Node.js version, and you can also enable specific experimental features by running Node.js with flags.

An Example Node.js Application

The most common example Hello World of Node.js is a web server:

To run this snippet, save it as a server.js file and run node server.js in your terminal.

This code first includes the Node.js http module .

Node.js has a fantastic standard library , including first-class support for networking.

The createServer() method of http creates a new HTTP server and returns it.

The server is set to listen on the specified port and host name. When the server is ready, the callback function is called, in this case informing us that the server is running.

Whenever a new request is received, the request event is called, providing two objects: a request (an http.IncomingMessage object) and a response (an http.ServerResponse object).

Those 2 objects are essential to handle the HTTP call.

The first provides the request details. In this simple example, this is not used, but you could access the request headers and request data.

The second is used to return data to the caller.

In this case with:

we set the statusCode property to 200, to indicate a successful response.

We set the Content-Type header:

and we close the response, adding the content as an argument to end() :

See for a list of Node.js examples that go beyond hello world.

How do I start with Node.js after I installed it?

Once we have installed Node.js, let's build our first web server. Create a file named app.js containing the following contents:

Now, run your web server using node app.js . Visit http://localhost:3000 and you will see a message saying "Hello World".

Refer to the Introduction to Node.js for a more comprehensive guide to getting started with Node.js.

Node.js Tutorial

Node.js - First Application

Before creating an actual "Hello, World!" application using Node.js, let us see the components of a Node.js application. A Node.js application consists of the following three important components −

Import required modules − We use the require directive to load Node.js modules.

Create server − A server which will listen to client's requests similar to Apache HTTP Server.

Read request and return response − The server created in an earlier step will read the HTTP request made by the client which can be a browser or a console and return the response.

Creating Node.js Application

Step 1 - import required module.

We use the require directive to load the http module and store the returned HTTP instance into an http variable as follows −

Step 2 - Create Server

We use the created http instance and call http.createServer() method to create a server instance and then we bind it at port 8081 using the listen method associated with the server instance. Pass it a function with parameters request and response. Write the sample implementation to always return "Hello World".

The above code is enough to create an HTTP server which listens, i.e., waits for a request over 8081 port on the local machine.

Step 3 - Testing Request & Response

Let's put step 1 and 2 together in a file called main.js and start our HTTP server as shown below −

Now execute the main.js to start the server as follows −

Verify the Output. Server has started.

Make a Request to the Node.js Server

Open in any browser and observe the following result.

Node.js Sample

Congratulations, you have your first HTTP server up and running which is responding to all the HTTP requests at port 8081.

Node.js Examples – Basic Examples, Module Examples, Advanced Examples

Node.js examples.

Node.js Examples : We shall go through examples of basics, fs module, mysql module, http module, url module, parsing json, etc. with Node.js.

Following is the list of Node.js Examples.

Node.js Example 1 – Simple Node.js Example

Following is a simple Node.js Example to print a message to console.


Node.js Example – Create a Module

Following is Node.js Example where we create a Calculator Node.js Module with functions add, subtract and multiply. And use the Calculator module in another Node.js file.

Node.js Example – Create a File

Following Node.js Example creates a file with data provided.

Run the program using node command in terminal or command prompt :

The file should be created next to your example node.js program with the content ‘Learn Node FS module’.

Node.js Example – Read a File

Node.js example – delete a file.

make sure there is a file named ‘sample.txt’ next to the node.js example program.

The file is successfully deleted.

Node.js Example – Write to a File

In this example, we shall write content, “Hello !” , to a text file sample.txt.

When the above program is run in Terminal,

NodeJS Example – Connect to MySQL Database

Nodejs example – select from table, nodejs example – select from table with where clause.

We shall apply a filter based on marks and fetch only those records with marks greater than 90.

Open a terminal from the location of above .js file and run selectFromWhere.js Node.js MySQL example program.

NodeJS Example – ORDER entries BY a column

An example to sort entries in ascending order w.r.t a column.

Run the above Node.js MySQL ORDER BY example program.

The records are sorted in ascending order with respect to marks column.

NodeJS Example – INSERT entries INTO Table

Run above Node.js MySQL program in Terminal.

Node.js Example – UPDATE Table Entries

Run the above program in Terminal

Node.js Example – DELETE Table Entries

Execute DELETE FROM query on specified table with filter applied on one or many properties of records in the table.

Node.js Example – Using Result Object

We can access the records in Result Set as an array and properties of a record using DOT (.) Operator.

Run the above program using node in Terminal

Node.js Example – Parse URL Parameters

Node.js example – parse json file.

Following example helps you to use JSON.parse() function and access the elements from JSON Object.

Node.js Example – Create HTTP Web Server

Node.js Example  – A HTTP Web Server that prepares a response with HTTP header and a message.

Run the Server

Open a browser and hit the url, “”, to trigger a request to our Web Server.

Create HTTP Web Server in Node.js

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Tutorial: Node.js for Beginners

If you're brand new to using Node.js, this guide will help you to get started with some basics.

Try using a Node.js module


If you are a beginner, trying Node.js for the first time, we recommend installing directly on Windows. For more information, see Should I install Node.js on Windows or Windows Subsystem for Linux

Try NodeJS with Visual Studio Code

If you have not yet installed Visual Studio Code, return to the prerequisite section above and follow the installation steps linked for Windows or WSL.

Open your command line and create a new directory: mkdir HelloNode , then enter the directory: cd HelloNode

Create a JavaScript file named "app.js" with a variable named "msg" inside: echo var msg > app.js

Open the directory and your app.js file in VS Code using the command: code .

Add a simple string variable ("Hello World"), then send the contents of the string to your console by entering this in your "app.js" file:

To run your "app.js" file with Node.js. Open your terminal right inside VS Code by selecting View > Terminal (or select Ctrl+`, using the backtick character). If you need to change the default terminal, select the dropdown menu and choose Select Default Shell .

In the terminal, enter: node app.js . You should see the output: "Hello World".

Notice that when you type console in your 'app.js' file, VS Code displays supported options related to the console object for you to choose from using IntelliSense. Try experimenting with Intellisense using other JavaScript objects .

Create your first NodeJS web app using Express

Express is a minimal, flexible, and streamlined Node.js framework that makes it easier to develop a web app that can handle multiple types of requests, like GET, PUT, POST, and DELETE. Express comes with an application generator that will automatically create a file architecture for your app.

To create a project with Express.js:

Open your command line (Command Prompt, Powershell, or whatever you prefer).

Create a new project folder: mkdir ExpressProjects and enter that directory: cd ExpressProjects

Use Express to create a HelloWorld project template: npx express-generator HelloWorld --view=pug

We are using the npx command here to execute the Express.js Node package without actually installing it (or by temporarily installing it depending on how you want to think of it). If you try to use the express command or check the version of Express installed using: express --version , you will receive a response that Express cannot be found. If you want to globally install Express to use over and over again, use: npm install -g express-generator . You can view a list of the packages that have been installed by npm using npm list . They'll be listed by depth (the number of nested directories deep). Packages that you installed will be at depth 0. That package's dependencies will be at depth 1, further dependencies at depth 2, and so on. To learn more, see Difference between npx and npm? on StackOverflow.

Examine the files and folders that Express included by opening the project in VS Code, with: code .

The files that Express generates will create a web app that uses an architecture that can appear a little overwhelming at first. You'll see in your VS Code Explorer window (Ctrl+Shift+E to view) that the following files and folders have been generated:

You now need to install the dependencies that Express uses in order to build and run your HelloWorld Express app (the packages used for tasks like running the server, as defined in the package.json file). Inside VS Code, open your terminal by selecting View > Terminal (or select Ctrl+`, using the backtick character), be sure that you're still in the 'HelloWorld' project directory. Install the Express package dependencies with:

At this point you have the framework set up for a multiple-page web app that has access to a large variety of APIs and HTTP utility methods and middleware, making it easier to create a robust API. Start the Express app on a virtual server by entering:

The DEBUG=myapp:* part of the command above means you are telling Node.js that you want to turn on logging for debugging purposes. Remember to replace 'myapp' with your app name. You can find your app name in the package.json file under the "name" property. Using npx cross-env sets the DEBUG environment variable in any terminal, but you can also set it with your terminal specific way. The npm start command is telling npm to run the scripts in your package.json file.

You can now view the running app by opening a web browser and going to: localhost:3000

Screenshot of Express app running in a browser

Now that your HelloWorld Express app is running locally in your browser, try making a change by opening the 'views' folder in your project directory and selecting the 'index.pug' file. Once open, change h1= title to h1= "Hello World!" and selecting Save (Ctrl+S). View your change by refreshing the localhost:3000 URL on your web browser.

To stop running your Express app, in your terminal, enter: Ctrl+C

Node.js has tools to help you develop server-side web apps, some built in and many more available via npm. These modules can help with many tasks:

Let's use the built-in OS module to get some information about your computer's operating system:

In your command line, open the Node.js CLI. You'll see the > prompt letting you know you're using Node.js after entering: node

To identify the operating system you are currently using (which should return a response letting you know that you're on Windows), enter: os.platform()

To check your CPU's architecture, enter: os.arch()

To view the CPUs available on your system, enter: os.cpus()

Leave the Node.js CLI by entering .exit or by selecting Ctrl+C twice.

You can use the Node.js OS module to do things like check the platform and return a platform-specific variable: Win32/.bat for Windows development, darwin/.sh for Mac/unix, Linux, SunOS, and so on (for example, var isWin = process.platform === "win32"; ).

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Node.js Examples

The following Node.js section contains a wide collection of Node.js examples. These Node.js examples are categorized based on the topics including file systems, methods, and many more. Each program example contains multiple approaches to solve the problem.

Node.js Tutorial Recent articles on Node.js

Node.js examples topics, file system.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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10 best Node.js app examples for enterprises, with metrics

Alexander Sokhanych

I have founded company in 2011 with mission to provide IT & Software experience worldwide.

We may receive compensation when you click on links but we are committed to editorial standarts and review process .

Microsoft, IBM, Cisco, Netflix, PayPal…These are just few of top companies using Node.js software for their products. Since initial release in 2009 this JavaScript environment has gained huge traction. Why? Node.js extremely comfortable to work with. Also, it allows front-end developers to build and execute the code on a server side. Thus, quicker development cycles. So who is using it and why? We have best Node.js app examples and reasons behind it for you. But a little helping information first.

What is Node.js?

In two words Node.js is a runtime environment. What it is exactly is an open-source JavaScript (hence the JS denotation) for network applications building. It allows NodeJS developers (programmers/coders) to execute the code on the server side. Meaning: on own computer or straight in a browser. Therefore, Node.js is light, scalable and fast way to write scripts.

Now, it is a well established part of so called JavaScript paradigm. It allows and unifies app development, removing the need for different languages. Node.js is mainly in use to create web applications in real-time. However, mobile app development is also possible, thanks to whole Node.js ecosystem. And its package manager – NPM, in particular.

With Node.js you are able to use the code or scripts that have been written in other languages, as well. So what about Node.js app examples? We’ve gathered several most telling projects and companies using Node.js.

#1 PayPal and Node.js

You’re going to find PayPal in every list of applications built on Node.js. And rightfully so. The service has to cope with over 200 million active user accounts worldwide. It does it seamlessly. Their initial problem has been dispersed teams doing tasks separately for browser and server applications. After PayPal has adopted Node.js, developers use the single language – JavaScript.

According to the company statement, their Node.js application was written 2 times faster than usual. And it contained 33% less code . Millions of people entrusting their payments is a true force indicator of this and other Node.js app examples in the list. For more details, you can read the case of Node.js app PayPal .

Paypal and other apps on Node.js

#2 Netflix and Node.js

As the largest global video content and streaming service , Netflix’s choice of Node.js speaks volumes. It is one of the most interesting Node.js app examples too. Because the goal of video provider was to power user interfaces specifically. With Node.js project they decreased build times and enabled user customization.

who uses Node js, Netflix app

In addition, Netflix won the battle for performance. The company reports, it has improved application’s load time by 70% . Node.js runtime has proved to be so efficient at Netflix, they even are moving data access layers to it. They also aim to write scripts as Node applications solely. To monitor the effect, Netflix developers use TTI metric – time to interactive. It is time between app startup and user interaction.

#3 Uber and Node.js

Uber is one the best Node.js app examples. Notably, a mobile app built with Node JS, that also impacts the cost to make an app like Uber – if one may be curious about. The company has been doubling in size every 6 or so months in the last two years. So obviously, data processing capabilities of Node.js was a winning solution.

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Scaling up according to rising demand for mobile taxi services is another factor. Uber needed a system to be reliable both to customers and drivers. Why have they chosen Node.js and JavaScript in general? Uber states three main reason for their Node.js project:

To prove their Node.js app success, Uber is now able to process over 2 million remote procedure calls (RPC) per 1 second. Even at peak times. Impressive!

who uses Node js

#4 LinkedIn and Node.js example

It’s true, LinkedIn irritates many and may seem antique. But it also does help employ. Still. As business networking system, it has over 450 million members. In 2016 the service was sold to Microsoft for $26 billion . Let’s repeat that – 26 billion American dollars. And guess what? LinkedIn mobile app backend has been built on Node JS. Few more words on one of the best Node.js app examples below.

Linkedin app as an example of who uses Node js

Performance efficiency and scale were two primary reasons for the company to switch to Node.js. And they have been satisfied with results. Who wouldn’t be? See for yourself how LinkedIn app on Node.js has performed since:

#5 Ebay and Node.js

For the huge (we mean really huge!) traffic Ebay had to go with proven technology. Node.js as part of JavaScript tech stack was a good fit for this e-commerce giant. After tough internal discussions Ebay engineers chose Node. The deciding factor was the need to make Ebay application as real-time as possible.

who uses Node js

With about 170 million active users , Ebay app on Node.js example shows the ability to maintain live connections to servers. The technical beauty and deploying principle at Ebay lie in following. Build once, deploy everywhere and automate the rest . Ebay started with one project, and now they are transitioning to full-featured stack on Node A case and point of being one the best Node.js app examples.

#6 Walmart and Node.js app example

Among large retail companies, Walmart is championing the entry into online e-commerce. After having fought with memory leak for 6 months, backend engineers opted for JavaScript services. And Node.js in particular. What makes it one of best Node.js app examples is that Walmart now gets more accurate results from client side.

Walmart uses Node as the orchestration layer over legacy APIs. They can now create new APIs for Walmart apps and deploy it within hours. In result, release times are significantly cut. For Node.js in production the company uses the tech stack consisting of:

who uses Node js

#7 Medium & Node.js project

The next cool service in our list of top Node.js app examples is Medium. It is a widely popular publishing platform that leverages NodeJS for its web servers. Medium app servers are built with Node.js with Nginx accompanying it. They also use Matador as a clean framework for Node environment.

Medium has 25 million monthly readers and thousands of articles appear each week. With service-oriented backend structure, Node.js allows Medium share code between client and server side. Using Node, they managed to speed up deployment times, up to 15 minutes . While main app servers usually deploy 5 times a day, and are capable of 10.

who uses Node js, top 10

#8 NASA and Node.js

“Node.js helps NASA keep astronauts safe.” Quite unexpected statement and instance in the list of Node.js app examples, right? Though, not exactly an application this Node.js project for space agency showcases the power of JS technology. After one dangerous incident in space, NASA found out its data to be scattered on many locations. They decided to build own end-to-end data system and went with Node.js.

NASA moved everything in a cloud and constructed a Node.js enterprise scale architecture. They used web API to link two environments. As result:

In real life, these figures mean safer conditions for astronauts to live and work in space. Stunning!

#9 Mozilla and Node.js

Second or third most popular web browser in the world, we’ll leave to others to discuss Mozilla. We’d rather highlight it as one of the best Node.js app examples, as Mozilla uses Node for numerous web apps. Like Mozilla Persona or BrowserID , for instance. Though these projects are over as of now, Node.js has been selected not without a reason.

who uses Node js

2 main reasons were memory capable to sustain about 1 million users and same language of JavaScript family. Mozilla team had everything easily available, in a single JS repository. So all the teams worked fast and productively. Now they use Node JS for cross-platform pages and web frameworks like Express .

#10 Trello and Node.js sample app

One of the best project management tools, Trello started out in 2011 fully on JavaScript. Trello developers built the server part with Node.js. Reason for such choice was the demand for numerous open connections support.

Trello also used Node for some prototyping. They tried it on a single-page app and then on a mockup server, eventually. With such arrangement engineers were able to try things out quickly and adjust the design. Trello server side was also completed with MongoDB, HAProxy (for load balance) and Redis for data sharing.

Node.js app performance metrics

When it comes to evaluating your Node.js application (website, mobile app, enterprise app, etc.) what metrics are at hand? Top NodeJS metrics include:

This means the ability to execute code in a queue. Node.js is famous for it’s non-blocking nature in this regard. Thus, a server can process unlimited number of operations. And the system can handle async operations. The metric is called Event handling latency.

This is what users (customers) are doing as they engage with your application. In best Node.js app examples like Uber or Netflix users complete business transactions in matter of seconds. Thus, proving application efficiency. This Node.js metric is all about measuring the response times.

Node.js apps depend on other services, systems and databases, as well. Apps on NodeJS may connect to other applications, caches, etc. So one has to keep in mind these dependencies too. What one could check? Response times, request rates, error rates, content sizes, APIs, etc.

Node.js has a terrific helper tool – Garbage Collector. It manages application’s memory and prevents memory leaks. Firstly, you can measure time spent on GC – the more runs, the more pauses in the system. Secondly, comparing memory at each run and checking for building trends.

Of course, there could be other metrics for Node.js apps. App topology, number of processes, cluster mode, or even custom metrics methods.

Benefits of using Node.js

To summarize our Node.js app examples overview, we’ll list several main gains with Node. It is a part of wide JavaScript full stack, that unifies language, data and all resources. Thus, making developer’s life much easier. Benefits of Node.js apps are:

Node.js, being a non-blocking event-driven model presented developers a possibility to build applications in real-time. With push technology and 2-way connections, many top companies use it, as we’ve shown in our best Node.js app examples here. You can approach ThinkMobiles, as the Node.js development company.[/sociallocker]

ThinkMobiles is one of most trusted companies conducting IT & software reviews since 2011. Our mission is to provide best reviews, analysis, user feedback and vendor profiles. Learn more about review process.

About author

Alexander Sokhanych

Alex started to develop software as early as in his school years, when he was 16 years old. These first attempts were gaming and healthcare mobile apps. During the high school period he has been producing trading bots and various trading software. Afterwards, he used to manage offline businesses, yet still devoting spare time to online gambling niche and web development. In 2011, Alex finally decided to launch an IT outsourcing company specializing in mobile apps and fintech. Since then, the team has also developed several proprietary products. In 2015 the company took on a commitment to solely concentrate on its own trademarked products and IT marketing activity.

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7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

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What is Node.js used for? Let’s look at five major types of apps you can build with the help of Node.js and some real-life Node. js app examples.

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

Node.js was first introduced in 2009, and this day became a turning point in the life of the JavaScript community. The dream came true, and JavaScript turned from a purely front-end development language into a full-stack. Node.js became the first step toward implementing Isomorphic JavaScript, also called Universal JavaScript. 

Today, developers can use JavaScript to develop apps, partially or from end to end. The back end of JavaScript apps is mostly written in Node.js. There are cases when Node.js application development is a perfect match with the project needs and cases when its choice isn’t so good. In this article, we will look at five major types of apps you can build with the help of Node.js and some real-life Node.js web application examples.

What is the Node.js Application?

What is the Node.js Application?

So, let’s start from the basics: according to TutorialsPoint , 

〝Node.js is a platform built on Chrome’s JavaScript runtime for easily building fast and scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. 〞

Node applications can be described as apps requiring a persistent connection from the browser to the server. They also refer to real-time applications such as chat or web push notifications.

What Is Node.js app Used For?

So, what is so revolutionary about using Node.js apps? The most suitable case for using Node.js is for apps aiming to handle large amounts of concurrent connections without choking. Hence, this tool is appropriate for various mobile, desktop, web, and IoT projects. So, what can you do with node.js?

Here are examples of Node.js apps: 

Benefits of using Node.js applications

Now that we know the basics of Node.js apps, it’s time to shift to the main Node.js application benefits. 

Top Node js application examples

Node.js is undoubtedly a powerful tool used for creating all sorts of applications. Want to discover more about why so many popular companies opt for this tool for their businesses? Let’s look at our new list. 

FinTech apps

The number one requirement for any FinTech app is reliability. The user should be confident that, once they provide some personal or financial information to the platform, there is no way it can be compromised, misused, lost, or stolen. Fortunately, reliability and data safety is what Node.js has to offer. Node.js is open-source, which means that once there are any errors or loopholes that may affect user data integrity, the developer community will fix them at once.

Among the most popular FinTech Node.js applications examples, there is PayPal.


The number of active users: 325 million 

The year of launch: 1998

The country of launch: USA (Palo Alto, California)

PayPal serves about 200,000,000 users daily, and it does it seamlessly — that’s the number one achievement of the Node.js non-blocking model. Yet, heavy data load isn’t the only problem that Node.js helped the PayPal team solve. Initially, the platform was developed with HTML, CSS, and JavaScript from the client-side and Java from the server-side. Two teams developed front and back end, which slowed down and complicated the development process. This issue turned into an annoying problem with time, so the company was looking for alternatives. After some time spent researching and prototyping, they decided to give Node.js a try. They began with developing an account overview page — the most trafficked one — in Node.js, but they simultaneously developed this very app in Java to play on the safe side. If something went wrong with the Node app, they would have a backup plan at hand. Later, the company admitted that they wrote their first Node.js application two times faster than the analogous Java one. It was constructed of 40% fewer files and 33% less code. 

The average response time in Node.js is about 35% lower than in Java, and Node handles two times more requests per second.

According to The PayPal Engineering Blog ,

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

Node.js helps us solve this by enabling both the browser and server applications to be written in JavaScript. It unifies our engineering specialties into one team which allows us to understand and react to our users’ needs at any level in the technology stack.

So, Node.js has become a lifesaving vest for the PayPal team as it granted them development efficiency, speed, convenience, and improved performance.


Ecommerce apps

E-commerce apps have to be stable — they must withstand heavy data load associated with multiple users searching through their catalogs, making orders, or processing payments. Node.js is perfect for large applications with numerous simultaneous user requests due to its event-based, non-blocking input/output model. Among the best-known eCommerce Node JS app examples, there are eBay and Groupon.


The number of active users: 182 million 

The year of launch: 1995

The country of launch: USA (San Jose, California)

Initially, eBay was built on a Java-based tech stack, with the entire workflow around Java and JVM. This tech stack seemed to be an obvious choice because of the heavy data load that the system had to handle. After all, the best decision would be to go with a tried and trusted core technology to achieve stability and reliability. Yet, as the business grew more popular, eBay had to scale its platform, and scalability isn’t a strong point of Java. It was when the company started exploring Node.js. They chose Node.js for three fundamental reasons: developer agility, system scalability, and app performance.

According to Senthil Padmanabhan, a Vice President, Fellow at eBay ,

We had two primary requirements for the project. The first was to make the application as real-time as possible–i.e., maintain live connections with the server. The second was to orchestrate a huge number of eBay-specific services that display information on the page–i.e., handle I/O-bound operations… With the success of the Node.js backend stack, eBay’s platform team is now developing a full-fledged front-end stack running on Node.js.

eBay seems to have never stopped growing, and Node.js helps eBay on its endless uphill journey. Few apps enjoy Node.js scalability as much as Node.js does.


Streaming apps

Streaming is rapidly turning into one of the most profitable branches of the entertainment industry. Similar to eCommerce apps, these platforms must cope with heavy data flow and multiple requests occurring simultaneously. Fortunately, Node.js is here to save the day.

Netflix is the most popular and heavily used streaming platform built with Node.js.


The year of launch: 1997

The country of launch: USA (Scotts Valley, California)

Initially, Netflix was built with Java on the back end and JavaScript on the front-end, but writing the app in two languages at the same time badly slowed down the development process. The company transitioned to Universal JavaScript to unite back-end and front-end under the same language and improve performance and speed. They opted in favor of Node.js for the back end and React.js development services for the front-end. After all, such an approach promised to facilitate the development process due to simple code writing, debugging, and many open-source packages and modules.

According to The Netflix Technology Blog ,

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

With Node.js and React.js, we can render from the server and subsequently render changes entirely on the client after the initial markup and React.js components have been transmitted to the browser. This flexibility allows for the application to render the exact same output independent of the location of the rendering. The hard separation is no longer present, and it’s far less likely for the server and client to be different than one another.

Today, Netflix is the largest streaming service used by over 182 million people worldwide. The transition to Universal JS and Node.js, in particular, allowed the company to withstand heavy data load and provide a practical user experience. It also allowed the developers to introduce any necessary changes quickly and easily.


Networking apps

Social networking apps have to be reliable and scalable. On the one hand, they feature many personal information — phone numbers and email addresses in the best-case scenario and financial information in the worst-case scenario. On the other hand, the system should expand as the network grows larger. Node.js offers a perfect opportunity for scalability, both horizontal and vertical. To scale horizontally, you can add new nodes to the existing system. To scale vertically, you can add additional resources to the existing nodes.

The best-known networking Node.js application examples are LinkedIn, Twitter Lite, Medium, and Trello.


The number of active users: 675 million 

The year of launch: 2002

The country of launch: USA (Mountain View, California)

LinkedIn was originally built as a Ruby on Rails process-based system. As the company expanded and the platform grew more popular, the urgent need for app scalability appeared. Yet, Ruby on Rails isn’t the most scalable language, and extending the project would require a lot of time and costs. Ruby on Rails could not provide the performance that LinkedIn needed, it wasn’t optimized for JSON translation, and it complicated the development of the mobile LinkedIn application. The engineering team was looking to replace RoR with some evented language or framework, such as EventMachine in Ruby or Twisted in Python. Eventually, they chose Node.js.

According to Kiran Prasad, a senior director of mobile engineering at LinkedIn ,

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

Along the way, we discovered that Node was roughly 20 times faster than what we had been using, and its memory footprint was smaller. Obviously, Node.js also offers other benefits beyond the technical aspects. JavaScript is a language lots of people understand and are comfortable coding in. Besides, it didn’t hurt that Node was getting a lot of hype at the time—and still is. In some ways, that makes it easier for me to recruit.

Kiran Prasad also admitted that Node.js won his affection because it facilitated and sped up the coding process. He claims that it takes only 20–100 milliseconds for Node to run the app and at least 15–30 seconds for the Rails console only to come up. Besides that, Node.js is lighter, thinner, and faster overall.

Going with Node.js was a significant technical vector change for the LinkedIn team. Yet, this change proved to be a good one. The outstanding performance and reliability of the LinkedIn platform prove that the LinkedIn team made an excellent choice.


Twitter Lite


The number of active Twitter users: 321 million

The year of launch: 2006

The country of launch: USA (San Francisco, California)

Every month, tens and hundreds of millions of users visit the mobile version of Twitter, and yet, Twitter Lite remains fast and reliable. It’s network resilient, interactive in under five seconds over 3G, and resource-efficient — it uses 40% less data than before. Also, Twitter Lite has become more development-friendly: app changes are easier and faster to code and deploy.

Twitter Lite is a JavaScript PWA on the client-side with a simple Node.js server. The Node.js server manages user authentication, constructs the initial app state, renders that initial HTML app shell, and requests data from the Twitter API once the app is opened by the browser.

According to Nicolas Gallagher, an engineer at Twitter ,

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

The simplicity of this basic architecture has helped us deliver exceptional service reliability and efficiency at scale – Twitter Lite an order of magnitude less expensive to run than our server-rendered desktop website.

Node.js helped Twitter to take its mobile application to a new level. Its powerful and seamless performance greatly improves the user experience. Meanwhile, the convenience of Node.js tools greatly facilitates development.


The number of active users: 25 million 

The year of launch: 2011

The country of launch: USA (New York City, New York)

The back end of Trello is built in Node.js. The company aimed for an event-driven server from the very beginning because Trello needs to display updates instantly, so many connections have to be kept open simultaneously. They used Node.js even at the prototyping stage — the Node.js server was a mere library of functions invoked over a WebSocket. Prototyping with Node.js granted the team great flexibility and development speed, which were essential for the prototypes to be regularly updated according to the market research findings.

Sure, Node.js development of Trello has been intertwined with issues and difficulties, for instance, a considerable amount of continuation passing. Yet, the Trello team solved these challenges, mainly using the async library to keep the code under control.

According to brett at Trello Blog ,

7 Node.js Application Examples and 5 Types of Applications You Can Build with Node.js

Node is great, and getting better all of the time as its active developer community churns out new and useful libraries.

Today, Trello is one of the most popular and often used task management platforms. As their business is expected to grow, the platform itself will be scaled up as well — fortunately, Node.js grants a vast room for the opportunity to do that.


The number of active users: 60 millions 

The year of launch: 2012

The country of launch: the USA (San Francisco, California)

The Medium platform is based on a service-oriented architecture. The main app servers are written in Node.js, which gives an important opportunity for code sharing between the server and the client. The choice of Node.js for Medium back end is associated with some performance drawbacks because, in some cases, the event loop is blocked. Yet, this issue is solved with multiple instances per machine and route expensive endpoints to specific instances. Moreover, the V8 engine of Node.js offers a huge benefit — the ability to see which ticks are taking longer to execute than others.

According to Dan Pupius at Medium Engineering ,

Our main app servers are still written in Node, which allows us to share code between server and client, something we use quite heavily with the editor and post transformations.

In any case, Node.js is the best available choice for the back end, and it does work its magic for Medium. Despite any development difficulties, Medium has grown into one of the most powerful, popular, and user-friendly blog platforms worldwide.


The subject of IoT and Node.js is so vast and vital that it’s worth its article. We have written one! Feel free to read it if you want a deep dive into the Node.js in IoT . But keeping it short, Node.js benefits IoT development because of the following:

In Conclusion

Node.js development is the number one choice for FinTech, eCommerce, streaming, networking, and IoT apps due to its scalability, reliability, and stability. Multiple worldwide-popular Node JS app examples prove that Node.js is the framework you can rely on. After all, the concept of Universal JavaScript — the same language being used on both ends of the project — has been proven effective and efficient by PayPal and Netflix. How do you think your app can be developed with JavaScript on both sides?

Do you have an idea for a Node JS app?

Does it seem to you that Node.js is the framework you need? Please, find out more about  Node.js development services  that we offer.

Alex Pletnov

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Emil Waszkowski

Emil Waszkowski

Best Node.js applications - Examples

With the total number of downloads of all Node.js versions increasing steadily , it’s only a matter of time before we see more of Node.js applications in use. Given the benefits of this open-source and cross-platform JavaScript runtime environment, that’s hardly surprising. Yet, there are already some examples of how both large companies and emerging startups have benefited from Node.js. 

We’ve already discussed whether you should choose Node.js as your backend - now when you’re familiar with its advantages, it’s time to see it action. Here are the best examples of apps that fully embrace Node.js as part of a modern technology stack.

Node.js in use - Examples  

As already mentioned , Node.js is a JavaScript runtime environment, which enables developing web apps with a single programming language (rather than use different languages for server- and client-side scripts) and serving multiple concurrent events in a single thread thanks to non-blocking I/O (Input/Output), among other things. This, in turn, makes Node.js fast, scalable and efficient in handling both data- and I/O-heavy workloads that are typical for various types of apps.

What are the best examples of Node.js applications, then?

Streaming apps

Thanks to its Stream API, Node.js a great choice for streaming applications. Basically, it makes it possible to transmit parts of the app’s code to a local machine without closing the connection, caching, or temporary data - which means that new components can easily be downloaded on demand.

Netflix is a perfect example of such an app. Before switching to Node.js, it was using Java on server-side and JavaScript on client-side, which forced the developers to know both languages and code twice. With Node.js, though, Netflix streamlined the development process and improved the app’s performance . In fact, the load time is said to have decreased by 70%.

example application node js

Social networking apps

What’s more, one of the primary reasons for Netflix to switch to Node was the ability to build a single-page application. SPAs might come in different shapes and sizes - yet, they can all benefit from Node’s asynchronous data flow. Thanks to the event loop, the app receives new data without the need to refresh, which makes Node.js a popular choice for social networking apps.

LinkedIn , as an example, switched from Ruby on Rails to Node.js , which made the app two to ten times faster on the client side, with only a fraction of the resources on the server side. Given the rising number of LinkedIn users, the performance boost was definitely needed - and appreciated by its developers, mainly due to the speed of development. Actually, Node also forms part of Twitter Lite due to similar reasons.

Apps revolving around data collection, visualisation and analysis

Node.js also happens to be a powerful solution for collecting, visualising and analysing data in real-time. It’s probably the reason why there are increasingly more startups that revolve around data in particular, and take advantage of Node.js once they’re at it. Take Heap , as an example. It’s said to capture every web, mobile, and cloud interaction automatically (be it clicks, submits, transactions, emails, or any behavioural data), in order to understand and serve customers better.  

When it comes to data visualisation, though, it’s rather YCharts that deserves more attention. It happens to be a cloud-based investment decision-making platform, which makes it easy to create technical charts in seconds to compare stocks and funds, just to name a few. Yet again, it collects data in real-time, constantly monitoring the market and providing relevant financial insights.

Fintech apps

Speaking of financial data, Node.js also seems to be a good fit for handling digital payments. In fact, PayPal was one of the first company that gave Node.js a chance back in the days when this technology was just starting to gain some traction. This decision quickly resulted in improved performance: 35% decrease in the average response time for the same page, to be exact. It might be the reason why some startups, such as JUSPAY , seem to be following PayPal’s footsteps.

example application node js

Online stores and marketplaces

Let’s go back to maintaining live connections with the server and handling a lot of requests at the same time for a moment, which Node.js is definitely known for. These were one of the reasons why eBay decided to go for Node - along with its speed and simplicity, performance, scalability, and “feeling of control” it gives the developers. It should come as no surprise, then, that Node.js is also used by Alibaba for both frontend toolchains and backend servers.

Walmart also provides an interesting Node.js example. The company re-engineered its mobile app to provide more features on the client side, and decided to build a fast, reliable and usable system with Node in order to become a leader in the online retail space. Given its current position, Node.js definitely brought Walmart closer to this goal.

Enterprise applications

Walmart is not the only enterprise-level company that’s been successfully using Node.js, though. According to the Node.js User Survey , 43% of Node.js programmers claim to have used it for enterprise apps - and, interestingly, the majority of them seems to be working for Fortune 500 companies .

The biggest Central and Eastern European convenience store chain Żabka has its own example of an enterprise solution powered by Node.js: an award-winning “ frappka ” app. The aim here was to meet the needs of the franchisees and make it easier for them to manage Żabka stores, which wouldn’t be that easy to achieve without Node and microservices architecture. Basically, microservices are single self-contained units which make up an application, yet, can be independently deployable and scalable. This architecture works very well with complex applications, which is probably why many well-known enterprises have already embraced it.

example application node js

Collaboration tools

Real-time applications, such as project management and communication tools that run across distributed devices, are also a common case of Node.js in use. Usually, such apps have plenty of users and thus, might be subject to heavy I/O operations (for example, a few users can edit, comment, post or attach something at the same time). This is when Node comes in useful - it makes the collaboration environment update seamlessly, handling both big traffic and intensive data exchange (mainly thanks to Event API and WebSockets).

Trello is a perfect example of a Node.js app that enables team collaboration. As written on the company’s blog , Node.js was first helpful when Trello was templating a tool for a one-page application. Yet, Node.js proved to have more benefits than that, which is why it eventually became the server-side of the application, along with MongoDB, Redis, and HAProxy.

E-learning platforms

Since Node.js can easily form part of collaboration tools, it shouldn’t be surprising that it happens to power e-learning platforms as well. Quizlet , for example, is said to be one of the largest online education platforms in the world with its 30 million active learners. Apparently, Node.js allowed scaling the app to handle over 600,000 visits a day.

CreativeLive also serves as a good example of a Node.js app that offers free live online classes in creative topics (such as photography, design, and craft). At the same time, Clever seems to be taking e-learning to the next level as it “powers technology in the classroom” and enables the management of all learning resources that every school owns.

IoT solutions

Node.js has also become one of the preferred solutions for IoT development . The reason behind it it’s mostly its capability to handle multiple concurrent requests and events coming from multiple IoT devices, which are known for generating a large volume of data.

Skycatch is an interesting example of such a solution. Essentially, it uses drones to take photos of construction sites, then analyses and exports multiple data types, and, at last, makes it possible to create and work with customized maps and 3D models.

Connected Boat , on the other hand, is meant for fleet owners to ensure the safety of boats at all times. It constantly monitors key parameters of the vessels through smart IoT sensors and provides easy access to relevant information that streamlines servicing and maintenance of each boat thanks to its mobile app. With the growing popularity of both IoT and Node.js, however, we’re bound to see more examples of such a combination.

example application node js

Node.js applications are here to stay

As can be seen, Node.js can be a good choice for developing many different types of applications, especially due to its ability to handle multiple concurrent requests and asynchronous data flow. Data streaming, social networking or project management apps are only a few popular use cases of Node.js that are worth exploring. In fact, Node.js applications happen to be increasingly more common as the technology becomes more mature.

Even though it might still be treated as a fairly new solution and has some drawbacks (such as not being a good fit for CPU-intensive apps), Node.js is definitely worth considering - if you’re in need of a data-driven app in particular.

Feeling inspired already? Let’s talk about developing your own Node.js application with us .

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// Tutorial //

How to build a node.js application with docker.

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By Kathleen Juell

How To Build a Node.js Application with Docker


The Docker platform allows developers to package and run applications as containers . A container is an isolated process that runs on a shared operating system, offering a lighter weight alternative to virtual machines. Though containers are not new, they offer a number of benefits — including process isolation and environment standardization — that are growing in importance as more developers use distributed application architectures.

When building and scaling an application with Docker, the starting point is typically creating an image for your application, which you can then run in a container. The image includes your application code, libraries, configuration files, environment variables, and runtime. Using an image ensures that the environment in your container is standardized and contains only what is necessary to build and run your application.

In this tutorial, you will create an application image for a static website that uses the Express and Bootstrap frameworks. You will then build a container using that image and push it to Docker Hub for future use. Finally, you will pull the stored image from your Docker Hub repository and build another container, demonstrating how you can recreate and scale your application.


To follow this tutorial, you will need:

Step 1 — Installing Your Application Dependencies

To create your image, you will first need to make your application files, which you can then copy to your container. These files will include your application’s static content, code, and dependencies.

Create a directory for your project in your non-root user’s home directory. The directory in this example named node_project , but you should feel free to replace this with something else:

Navigate to this directory:

This will be the root directory of the project.

Next, create a package.json file with your project’s dependencies and other identifying information. Open the file with nano or your favorite editor:

Add the following information about the project, including its name, author, license, entrypoint, and dependencies. Be sure to replace the author information with your own name and contact details:

This file includes the project name, author, and license under which it is being shared. npm recommends making your project name short and descriptive, and avoiding duplicates in the npm registry . This example lists the MIT license in the license field, permitting the free use and distribution of the application code.

Additionally, the file specifies:

Though this file does not list a repository, you can add one by following these guidelines on adding a repository to your package.json file . This is a good addition if you are versioning your application.

Save and close the file by typing CTRL + X . Press Y and then ENTER to confirm your changes.

To install your project’s dependencies, run the following command:

This will install the packages you’ve listed in your package.json file in your project directory.

You can now move on to building the application files.

Step 2 — Creating the Application Files

You will create a website that offers users information about sharks. This application will have a main entrypoint, app.js , and a views directory that will include the project’s static assets. The landing page, index.html , will offer users some preliminary information and a link to a page with more detailed shark information, sharks.html . In the views directory, you will create both the landing page and sharks.html .

First, open app.js in the main project directory to define the project’s routes:

In the first part of this file, create the Express application and Router objects and define the base directory and port as constants:

The require function loads the express module, which is used to create the app and router objects. The router object will perform the routing function of the application, and as you define HTTP method routes you will add them to this object to define how your application will handle requests.

This section of the file also sets a couple of constants, path and port :

Next, set the routes for the application using the router object:

The router.use function loads a middleware function that will log the router’s requests and pass them on to the application’s routes. These are defined in the subsequent functions, which specify that a GET request to the base project URL should return the index.html page, while a GET request to the /sharks route should return sharks.html .

Finally, mount the router middleware and the application’s static assets and tell the app to listen on port 8080 :

The finished app.js file includes all of the following lines of code:

Save and close the file when you are finished.

Next, add some static content to the application. Start by creating the views directory:

Open the landing page file, index.html :

Add the following code to the file, which will import Boostrap and create a jumbotron component with a link to the more detailed sharks.html info page:

The following is a quick break-down of the various elements in your index.html file. The top-level navbar allows users to toggle between the Home and Sharks pages. In the navbar-nav subcomponent, you are using Bootstrap’s active class to indicate the current page to the user. You’ve also specified the routes to your static pages, which match the routes you defined in app.js :

Additionally, you’ve created a link to your shark information page in your jumbotron’s button:

There is also a link to a custom style sheet in the header:

You will create this style sheet at the end of this step.

With the application landing page in place, you can create your shark information page, sharks.html , which will offer interested users more information about sharks.

Open the file:

Add the following code, which imports Bootstrap, the custom style sheet, and detailed information about certain sharks:

Note that in this file, you once again use the active Bootstrap class to indicate the current page.

Finally, create the custom CSS style sheet that you’ve linked to in index.html and sharks.html by creating a css folder in the views directory:

Open the style sheet:

Add the following code, which will set the desired color and font for your pages:

In addition to setting font and color, this file also limits the size of the images by specifying a max-width of 80%. This will prevent the pictures from taking up more room than you would like on the page.

With the application files in place and the project dependencies installed, you are ready to start the application.

If you followed the initial server setup tutorial in the prerequisites, you will have an active firewall permitting only SSH traffic. To permit traffic to port 8080 run:

To start the application, make sure that you are in your project’s root directory:

Start the application with node app.js :

Navigate your browser to http:// your_server_ip :8080 . The following is your landing page:

Application Landing Page

Clicking on the Get Shark Info button will take you to the following information page:

Shark Info Page

You now have an application up and running. When you are ready, quit the server by typing CTRL + C . You can now move on to creating the Dockerfile that will allow you to recreate and scale this application as desired.

Step 3 — Writing the Dockerfile

Your Dockerfile specifies what will be included in your application container when it is executed. Using a Dockerfile allows you to define your container environment and avoid discrepancies with dependencies or runtime versions.

Following these guidelines on building optimized containers , will make your image as efficient as possible by minimizing the number of image layers and restricting the image’s function to a single purpose — recreating your application files and static content.

In your project’s root directory, create the Dockerfile:

Docker images are created using a succession of layered images that build on one another. The first step will be to add the base image for your application that will form the starting point of the application build.

You can use the node: 10-alpine image . The alpine image is derived from the Alpine Linux project, and will help keep your image size down. For more information about whether or not the alpine image is the right choice for your project, please see the full discussion under the Image Variants section of the Docker Hub Node image page .

Add the following FROM instruction to set the application’s base image:

This image includes Node.js and npm. Each Dockerfile must begin with a FROM instruction.

By default, the Docker Node image includes a non-root node user that you can use to avoid running your application container as root . It is a recommended security practice to avoid running containers as root and to restrict capabilities within the container to only those required to run its processes. We will therefore use the node user’s home directory as the working directory for our application and set them as our user inside the container. For more information about best practices when working with the Docker Node image, see this best practices guide .

To fine-tune the permissions on your application code in the container, create the node_modules subdirectory in /home/node along with the app directory. Creating these directories will ensure that they have the correct permissions, which will be important when you create local node modules in the container with npm install . In addition to creating these directories, set ownership on them to your node user:

For more information on the utility of consolidating RUN instructions, see this discussion of how to manage container layers .

Next, set the working directory of the application to /home/node/app :

If a WORKDIR isn’t set, Docker will create one by default, so it’s a good idea to set it explicitly.

Next, copy the package.json and package-lock.json (for npm 5+) files:

Adding this COPY instruction before running npm install or copying the application code allows you to take advantage of Docker’s caching mechanism. At each stage in the build, Docker will check to see if it has a layer cached for that particular instruction. If you change the package.json , this layer will be rebuilt, but if you don’t, this instruction will allow Docker to use the existing image layer and skip reinstalling your node modules.

To ensure that all of the application files are owned by the non-root node user, including the contents of the node_modules directory, switch the user to node before running npm install :

After copying the project dependencies and switching the user, run npm install :

Next, copy your application code with the appropriate permissions to the application directory on the container:

This will ensure that the application files are owned by the non-root node user.

Finally, expose port 8080 on the container and start the application:

EXPOSE does not publish the port, but instead functions as a way of documenting which ports on the container will be published at runtime. CMD runs the command to start the application — in this case, node app.js .

Note: There should only be one CMD instruction in each Dockerfile. If you include more than one, only the last will take effect.

There are many things you can do with the Dockerfile. For a complete list of instructions, please refer to Docker’s Dockerfile reference documentation .

This is the complete Dockerfile:

Save and close the file when you are finished editing.

Before building the application image, add a .dockerignore file . Working in a similar way to a .gitignore file , .dockerignore specifies which files and directories in your project directory should not be copied over to your container.

Open the .dockerignore file:

Inside the file, add your local node modules, npm logs, Dockerfile, and .dockerignore file:

If you are working with Git then you will also want to add your .git directory and .gitignore file.

You are now ready to build the application image using the docker build command. Using the -t flag with docker build will allow you to tag the image with a memorable name. Because you’re going to push the image to Docker Hub, include your Docker Hub username in the tag. You can tag the image as nodejs-image-demo , but feel free to replace this with a name of your own choosing. Remember to also replace your_dockerhub_username with your own Docker Hub username:

The . specifies that the build context is the current directory.

It will take some time to build the image. Once it is complete, check your images:

It is now possible to create a container with this image using docker run . You will include three flags with this command:

Run the following command to build the container:

Once your container is up and running, you can inspect a list of your running containers with docker ps :

With your container running, you can now visit your application by navigating your browser to http:// your_server_ip :

Now that you have created an image for your application, you can push it to Docker Hub for future use.

Step 4 — Using a Repository to Work with Images

By pushing your application image to a registry like Docker Hub, you make it available for subsequent use as you build and scale your containers. To demonstrate how this works, you will push the application image to a repository and then use the image to recreate your container.

The first step to pushing the image is to log in to the Docker Hub account you created in the prerequisites:

When prompted, enter your Docker Hub account password. Logging in this way will create a ~/.docker/config.json file in your user’s home directory with your Docker Hub credentials.

You can now push the application image to Docker Hub using the tag you created earlier, your_dockerhub_username / nodejs-image-demo :

Let’s test the utility of the image registry by destroying our current application container and image and rebuilding them with the image in our repository.

First, list your running containers:

Using the CONTAINER ID listed in your output, stop the running application container. Be sure to replace the highlighted ID below with your own CONTAINER ID :

List your all of your images with the -a flag:

The following is output with the name of your image, your_dockerhub_username / nodejs-image-demo , along with the node image and the other images from your build:

Remove the stopped container and all of the images, including unused or dangling images, with the following command:

Type y when prompted in the output to confirm that you would like to remove the stopped container and images. Be advised that this will also remove your build cache.

You have now removed both the container running your application image and the image itself. For more information on removing Docker containers, images, and volumes, please see How To Remove Docker Images, Containers, and Volumes .

With all of your images and containers deleted, you can now pull the application image from Docker Hub:

List your images once again:

You will see your application image:

You can now rebuild your container using the command from Step 3:

List your running containers:

Visit http:// your_server_ip once again to view your running application.

In this tutorial you created a static web application with Express and Bootstrap, as well as a Docker image for this application. You used this image to create a container and pushed the image to Docker Hub. From there, you were able to destroy your image and container and recreate them using your Docker Hub repository.

If you are interested in learning more about how to work with tools like Docker Compose and Docker Machine to create multi-container setups, you can look at the following guides:

For general tips on working with container data, see:

If you are interested in other Docker-related topics, please see our complete library of Docker tutorials .

Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases.

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Tutorial Series: From Containers to Kubernetes with Node.js

In this series, you will build and containerize a Node.js application with a MongoDB database. The series is designed to introduce you to the fundamentals of migrating an application to Kubernetes, including modernizing your app using the 12FA methodology, containerizing it, and deploying it to Kubernetes. The series also includes information on deploying your app with Docker Compose using an Nginx reverse proxy and Let’s Encrypt.

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How can I build this project using a gradle and use created artifact .jar file for building docker image. Is it possible to build nodejs project using gradle build tool.

Please reply it’s very urgent.

Thank you for this showing the implementation step by step.

Why do we need a --chown flag in COPY when a USER node was run earlier?

Thanks Kathleen, this was very easy to understand.

Great. I took an online course a while back and now it all makes sense. I had to take this tutorial I am working on an application for my employer. Thank you Kathleen.

 I like this

Hi Kathleen. Great tutorial. As pointed out here one should run a node app like CMD [“node”,“app.js”]. Regards.

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Cisco press publications | online degrees | pearson e-books | q&a and free downloads it learning it lessons, building an aws lambda serverless architecture application with node.js and c# example codes, what is aws lambda & serverless architecture.

AWS Lambda is a serverless computing service offered by Amazon Web Services (AWS). It allows users to run code without provisioning or managing servers.

Instead, users upload their code to AWS Lambda and it automatically scales and manages the infrastructure required to run the code.

Serverless architecture, also known as function-as-a-service (FaaS), is a cloud computing model where the cloud provider manages the infrastructure and users only pay for the actual usage of their application.

This means that users do not need to worry about managing servers, operating systems, or any other infrastructure.

They simply focus on writing the code for their application and the cloud provider takes care of the rest.

AWS Lambda is one of the most popular implementations of serverless architecture.

It allows users to create functions in a variety of programming languages, such as Python , Node.js, Java, and C#.

These functions can be triggered by events, such as changes to a database or a file being uploaded to an S3 bucket, and they can be used to build a wide range of applications,

from simple data processing scripts to complex web applications.

AWS lambda serverless architecture example code application written in Node.js

Here is an example of a simple AWS Lambda function written in Node.js that can be used in a serverless architecture:

This function is triggered by an event and returns a message that includes the name passed in the event, or “World” if no name is provided.

The handler function is exported as the entry point for the Lambda function.

To use this function in a serverless architecture, you would typically create a serverless.yml file that defines the function and any necessary resources, such as an API Gateway endpoint.

Here is an example of a serverless.yml file that uses the above function:

This serverless.yml file defines a service called “my-service” and specifies that it should run on the AWS platform with the Node.js 14.x runtime.

It also defines a function called “hello” that uses the handler function from the previous example.

Finally, it defines an API Gateway endpoint that maps the HTTP GET method to the “hello” function,

which means that when a user visits the “/hello” path on this API Gateway endpoint, the Lambda function will be triggered and return the “Hello, World!” message.

AWS lambda serverless architecture building small application example code in C#

Here is an example of a simple AWS Lambda function written in C#:

This function takes a dictionary as input and returns a string message that includes the name passed in the input dictionary or “World” if no name is provided.

To use this function in a serverless architecture with AWS Lambda, you would create an AWS Lambda function and upload the compiled C# code as a .NET Core 3.1 or later runtime package.

You can use the AWS Management Console, the AWS CLI, or an AWS SDK to deploy your function.

Here’s an example of using the AWS CLI to deploy the above function:

2. Create an AWS Lambda function with the .NET Core 3.1 runtime:

3. Invoke the AWS Lambda function:

This command will invoke the function with the input dictionary {"name": "John"} and write the response to a file named response.txt .

AWS lambda serverless architecture example python code application

here’s an example of a simple AWS Lambda function written in Python that can be used in a serverless architecture:

This function is similar to the Node.js example I provided earlier.

It takes an event as input, which is a dictionary that may contain a “name” key. If the “name” key is present, it includes it in the message.

If not, it uses “World” as the default name. Finally, it returns a dictionary that includes the HTTP status code and the message as a JSON-encoded string.

To use this function in a serverless architecture, you would create a serverless.

yml file that defines the function and any necessary resources, such as an API Gateway endpoint. Here is an example of a serverless.

yml file that uses the above function:

This serverless.yml file defines a service called “my-service” and specifies that it should run on the AWS platform with the Python 3.9 runtime.

It also defines a function called “hello” that uses the lambda_handler function from the previous example.

Finally, it defines an API Gateway endpoint that maps the HTTP GET method to the “hello” function, which means that when a user visits the “/hello” path on this API Gateway endpoint, the Lambda function will be triggered and return the “Hello, World!” message.

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liva jorge

Text-to-Speech with AWS Polly and Node.js: Implementation, Best Practices, and Use Cases

Text-to-speech (TTS) technology has been around for decades, but recent advancements in artificial intelligence and cloud computing have made it more accurate, natural-sounding, and widely accessible than ever before. With Amazon Web Services (AWS) Polly, developers can add high-quality TTS functionality to their applications with just a few lines of code. In this blog, we will explore the benefits, implementation, best practices, and use cases of AWS Polly and Node.js for text-to-speech.

Benefits of Text-to-Speech with AWS Polly and Node.js

AWS Polly is a fully managed service that uses advanced deep learning technologies to convert written text into natural-sounding speech. It supports over 60 languages and a wide range of voices, including male and female, adult and child, and even accents and emotions. Some of the key benefits of using AWS Polly for text-to-speech include:

Implementation of Text-to-Speech with AWS Polly and Node.js

Implementing text-to-speech with AWS Polly and Node.js is easy and straightforward. Here are the basic steps involved:

Best Practices for Text-to-Speech with AWS Polly and Node.js

To ensure the best performance, quality, and user experience of your text-to-speech application, here are some best practices to follow:

Another key benefit of AWS Polly is its ability to handle multiple languages and accents. This is particularly important for businesses that operate in diverse regions and need to provide content in different languages to their users. AWS Polly supports dozens of languages and accents, including English, French, German, Spanish, Portuguese, Mandarin, Japanese, and many more. This means that businesses can easily create audio content in the language and accent that their users prefer, improving user experience and engagement.

In conclusion, the implementation of text-to-speech technology using AWS Polly and Node.js offers a wide range of benefits and use cases for businesses and individuals alike . With its high-quality voice output, customizable speech styles, and wide language support, AWS Polly is a reliable and efficient tool for generating natural-sounding speech. Node.js, with its lightweight and scalable architecture, provides a flexible platform for integrating AWS Polly into various applications and services.

By leveraging this technology, businesses can improve accessibility for users with visual impairments, enhance the user experience of their applications, and create engaging multimedia content. Developers can benefit from the simplicity and ease of integration of the AWS Polly API and can utilize the technology to build innovative applications and services that can communicate with users through natural-sounding speech.

As with any technology implementation, it is important to follow best practices for security and scalability, and to consider factors such as cost and performance when making decisions about its use. However, with the right approach, the implementation of text-to-speech technology using AWS Polly and Node.js can unlock a world of possibilities for businesses and developers alike.

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Text to speech

React + Node.js + Express + MySQL example: Build a CRUD App

In this tutorial, I will show you how to build full-stack React + Node.js + Express + MySQL example with a CRUD Application. The back-end server uses Node.js + Express for REST APIs, front-end side is a React.js client with React Router, Axios & Bootstrap.

Related Posts: – React Redux + Node.js + Express + MySQL example: Build a CRUD App – React + Node.js Express: Login example with JWT – React File Upload with Axios and Progress Bar to Rest API

Run both projects in one place: How to integrate React with Node.js Express on same Server/Port

Dockerize: Docker Compose: React, Node.js, MySQL example

React + Node.js + Express + MySQL example Overview

React, node.js express, mysql architecture, project structure, create node.js app, setup express web server, configure mysql database & sequelize, initialize sequelize, define the sequelize model, create the controller, run the node.js express server, setup react.js project, import bootstrap to react crud app, add react router to react crud app, add navbar to react crud app, initialize axios for react crud http client, create data service, create react components/pages, run react crud app, source code, further reading.

We will build a full-stack Tutorial Application in that:

Here are screenshots of the example.

– Add an item:


– Show all items:


– Click on Edit button to view details of an item:


On this Page, you can:


– Search objects by field ‘title’:


– Check MySQL database:


We’re gonna build the application with following architecture:


– Node.js Express exports REST APIs & interacts with MySQL Database using Sequelize ORM. – React Client sends HTTP Requests and retrieves HTTP Responses using Axios , consume data on the components. React Router is used for navigating to pages.

This is our React Node.js Express Sequelize application demo (with brief instruction) running with MySQL database.

Node.js Express Back-end

These are APIs that Node.js Express App will export:


– db.config.js exports configuring parameters for MySQL connection & Sequelize. – Express web server in server.js where we configure CORS, initialize & run Express REST APIs. – Next, we add configuration for MySQL database in models / index.js , create Sequelize data model in models / tutorial.model.js . – Tutorial controller in controllers . – Routes for handling all CRUD operations (including custom finder) in tutorial.routes.js .

If you want to use raw SQL (without Sequelize), kindly visit: Build Node.js Rest APIs with Express & MySQL

This backend works well with frontend in this tutorial.


First, we create a folder:

Next, we initialize the Node.js App with a package.json file:

We need to install necessary modules: express , sequelize , mysql2 and cors . Run the command:

In the root folder, let’s create a new server.js file:

What we do are: – import express , and cors modules:

– create an Express app, then add body-parser ( json and urlencoded ) and cors middlewares using app.use() method. Notice that we set origin: http://localhost:8081 . – define a GET route which is simple for test. – listen on port 8080 for incoming requests.

Now let’s run the app with command: node server.js . Open your browser with url http://localhost:8080/ , you will see:


Yeah, the first step is done. We’re gonna work with Sequelize in the next section.

In the app folder, we create a separate config folder for configuration with db.config.js file like this:

First five parameters are for MySQL connection. pool is optional, it will be used for Sequelize connection pool configuration:

For more details, please visit API Reference for the Sequelize constructor .

We’re gonna initialize Sequelize in app / models folder that will contain model in the next step.

Now create app / models / index.js with the following code:

Don’t forget to call sync() method in server.js :

In development, you may need to drop existing tables and re-sync database. Just use force: true as following code:

In models folder, create tutorial.model.js file like this:

This Sequelize Model represents tutorials table in MySQL database. These columns will be generated automatically: id , title , description , published , createdAt , updatedAt .

After initializing Sequelize, we don’t need to write CRUD functions, Sequelize supports all of them:

These functions will be used in our Controller.

We can improve the example by adding Comments for each Tutorial. It is the One-to-Many Relationship and I write a tutorial for this at: Sequelize Associations: One-to-Many example – Node.js, MySQL

Or you can add Tags for each Tutorial and add Tutorials to Tag (Many-to-Many Relationship): Sequelize Many-to-Many Association example with Node.js & MySQL

Inside app / controllers folder, let’s create tutorial.controller.js with these CRUD functions:

You can continue with step by step to implement this Node.js Express App in the post: Node.js Rest APIs example with Express, Sequelize & MySQL

Run our Node.js application with command: node server.js . The console shows:

React.js Front-end


– The App component is a container with React Router . It has navbar that links to routes paths.

– TutorialsList component gets and displays Tutorials. – Tutorial component has form for editing Tutorial’s details based on :id . – AddTutorial component has form for submission new Tutorial.

– These Components call TutorialDataService methods which use axios to make HTTP requests and receive responses.

Or you can use React with Redux:


More details at: React Redux CRUD App example with Rest API


– package.json contains 4 main modules: react , react-router-dom , axios & bootstrap . – App is the container that has Router & navbar. – There are 3 components: TutorialsList , Tutorial , AddTutorial . – http-common.js initializes axios with HTTP base Url and headers. – TutorialDataService has methods for sending HTTP requests to the Apis. – .env configures port for this React CRUD App.

For React Hooks version, kindly visit this tutorial .

For Typescript version:

example application node js

Please visit: React Typescript CRUD example with Web API

Open cmd at the folder you want to save Project folder, run command: npx create-react-app react-crud

After the process is done. We create additional folders and files like the following tree:






Run command: npm install bootstrap .

Open src / App.js and modify the code inside it as following-

– Run the command: npm install react-router-dom . – Open src / index.js and wrap App component by BrowserRouter object.

Open src / App.js , this App component is the root container for our application, it will contain a navbar , and also, a Routes object with several Route . Each Route points to a React Component.

Let’s install axios with command: npm install axios . Under src folder, we create http-common.js file with following code:

You can change the baseURL that depends on REST APIs url that your Server configures.

In this step, we’re gonna create a service that uses axios object above to send HTTP requests.

services / tutorial.service.js

We call axios get , post , put , delete method corresponding to HTTP Requests: GET, POST, PUT, DELETE to make CRUD Operations.

Now we’re gonna build 3 components corresponding to 3 Routes defined before.

You can continue with step by step to implement this React App in the post: – React.js CRUD example to consume Web API – or React Hooks CRUD example to consume Web API

Using React with Redux: – React Redux CRUD example with Rest API – React Hooks + Redux: CRUD example with Rest API

For Typescript version: React Typescript CRUD example to consume Web API

You can run our App with command: npm start . If the process is successful, open Browser with Url: http://localhost:8081/ and check it.

You can find Github source code for this tutorial at: React + Node App Github

Today we have an overview of React.js + Node.js Express + MySQL example when building a full-stack CRUD App.

We also take a look at client-server architecture for REST API using Express & Sequelize ORM, as well as React.js project structure for building a front-end app to make HTTP requests and consume responses.

Next tutorials show you more details about how to implement the system (including source code): – Back-end:

– Front-end:

You will want to know how to run both projects in one place: How to integrate React with Node.js Express on same Server/Port

With Pagination: React Pagination with API using Material-UI


Or Serverless with Firebase: – React Firebase CRUD with Realtime Database – React Firestore CRUD App example | Firebase Cloud Firestore

Happy learning, see you again!

54 thoughts to “React + Node.js + Express + MySQL example: Build a CRUD App”

Hi, great tutorials, thanks for that! Rather new to Node and SQL.

I have got the tutorial from working via Postman, but don’t really know how to sync it t work with the React project. Should I start both node and npm start on both projects at the same time? Because the React live server is returning a 404 for all requests.

I have a feeling it is not connecting with my database.. Should I configure MySQL to port 8080? Or is there something I have missed to add to the React project from the Node JS rest API project? I take it they should be separate repositories?

Working with MySQL via MySQL Workbench.

Thanks a bunch!

Hi, you need to run Node Express backend first. It will export APIs at localhost:8080 . Then you can run React for frontend at localhost:8081 with npm start . Finally, open url with address: http://localhost:8081/ .

how was the serviceWorker.js file created?

I think I made a mistake in something that ended up not creating him.

Hi, it is generated by old version of React through the create-react-app command. If you use new React version, don’t care 🙂

Such a terrific series of tutorials, thank you so much.

Do you have a tutorial which covers the construction of React web forms for relational Sequelize data?

I have two related models (belongsTo/hasOne) and I want to build a form with a select list which respects the relationship. E.g. a Employer hasMany Staff and a Staff belongsTo an Employer. A select list on the Employer form should show Companies by name and stores the companyId on the Employee record. (This is a made-up example but you get the idea.)

Is there any built-in tooling to create the a select list from the model? I can imagine how to do it manually, but I wonder if there are helpers that I am unaware of.

Thank you very much. It is very helpful for any beginners who want to start a CRUD. I especially like in this is that you added diagrams and code because people easily understand. Very knowledgeable and creative information. My appreciation to you.

Please pass me source codes for this tutorial.

Hi, you can find Github in the tutorials I mention at Conclusion section 🙂

Hi, do you have any tutorial to show how to connect cloud database with a website? Since the local database can not be accessed by other users.

Hi, you can read following tutorial: Deploying/Hosting Node.js app on Heroku with MySQL database

Thanks for the well-written tutorial. I think I learned more from this.

Whenever I learn something new, or want to check if my implementations are right, I always go to your website. Thank you so much for everything! <3 Regards from Philippines!

Hi, bezkoder,

Your tutorial was useful for me. But I have a question, regarding the list, I tried to add the setInterval() method. But it does not work, would you have a clue, thank you in advance

Nice tutorial! I am new to node.js and I noticed that you didn’t define “findByTitle” in routes.js of the server end, but you used it in the server.js in the front end. How does this work? Thanks!

Hi, you can look at controllers / tutorial.controller.js . We have findAll method with title as query param. So the client (frontend) just sends http request with suffix /api/tutorials?title=[title] .

In tutorial.routes.js , we have:

I am getting experience all the time by reading your tutorials. Thanks!

Will likely be back to get more tutorials from you. Thanks!

I needed to thank you for this fantastic tutorial!! I certainly loved every bit of it.

Thanks for the tutorial. Regards

one question here you are using mysql database if i want to use sql express can i put dialect:”mssql” instead of dialect:”mysql” ???

Hi, you can use the backend with MSSQL database with the tutorial: Node.js CRUD example with SQL Server (MSSQL)

Thank you so much, am learning so much! How can I expand your example so I can interact with multiple different tables? If I have table “user”, with its own fields, do I make a user.routes.js, user.controller.js, etc for each table? Is there a sleek way to make this more general? Thank you!

I also encountered this error, what I did was that, I left the password space to an empty string

very interesting, good job and thanks for sharing this fullstack tutorial.

A very detailed and informative tutorial What would be the best hosting option for a custom app that uses React + Node.js + Express + MySQL , as explained in your tutorial? Thank you!

VSC says ‘bodyParser’ is deprecated.ts(6385) Possibly this is the solution

It can’t find the three objects, Tutorials, AddTutorial, Tutorial, what do I miss?

Kind regards,

Marco de Boer

Hi, please visit the tutorial I mentioned right there for next steps.

SequelizeAccessDeniedError: Access denied for user ‘root’@’’ (using password: YES)

what is the correct initial password for mysql2 ?

My fault, had no sqlsever just teh client installed 😉 thx

You need to ensure that this password is the same as the one you use in localhost.

Sorry, what do you mean the same password as in localhost? What localhost password? Also, do we need sqlserver installed? Do we have to create the database (I don’t recall any instruction to do that)? It’s a great tutorial but I feel like I am missing some very key instructions. My problem is EACCESS denied.

Hi, i want some help, so i follow the tuto and i have this error i can’t find why “(node:13696) UnhandledPromiseRejectionWarning: SequelizeDatabaseError: Table ‘testdb.tutorials’ doesn’t exist”, i searched to resolve this but I tried on my own and look for where the problem could come from, even if I suck I try to manage but here I block, I would like to know if you have any leads

That means you don’t have Table in your local MySQL. First create “testdb” named database and create “tutorials” named table inside it.

Hi, I would like to use your app on my own host (with Planet Hoster). All it’s done, and well set, React and NodeJS launched and the files compiled, but I have a 503 error on the server. The support told me it’s because of the use of the port 8081 and the fact I’m trying to launch an other server on their server. How I can disallow the use of the localhost server and use only the server of my host ? Thanks for your help, and thanks for the tutorial ! 🙂 Arthur

This excellent website really has all the information and facts I needed concerning this subject and didn’t know who to ask.

Many thanks for the tutorial.

Hi..I’ve a problem in running the application. Can I know how to run and which file to run with commands please?

For React Client: npm run start For Node.js Server: node server.js

Can’t we create a similar front-end without react (i mean in node.js – javascript)

thanks; i cannot connect with mysql directly? i need always build a API?

yes, you need to create a code in node js that queries your database and then throws that data in an api, then you access it in your application from a fetch if it is in react js

I’m very new in node.js and your demo is very useful. I follow it step by step but I got an error as below. Please tell me wrong I did? It was occurred in model file while define data type. I got an error below type: Sequelize.INTEGER ^ TypeError: Cannot read property ‘INTEGER’ of undefined

Hi, you should initialize Sequelize first, please read this section . Once you have the Sequelize object, pass it to the function which define Sequelize model: db.tutorials = require("./tutorial.model.js")(sequelize, Sequelize);

TҺis React tutorial іѕ really good, I like your web site so much, waiting for new React tutorial!

Thank you so much for your effort to make this fullstack React Node tutorial!

Hi, Nice tutorial. Please provide a git url , etc. which I can download and start. I want something to start with for my project.

Hi, you can find github source code in the next posts (Conclusion section). 🙂

I follow the code in your site of

i run the node server on port 3000. it run successful

In your site you have example to connect react by using Sequelize but not without this. as in node you connect to MySQL directly without using the Sequelize .

Please give the link which connect the front end to back-end without using Sequelize.

Hi, the front-end doesn’t need to care about whether the back-end uses Sequelize or not. They connect toghether via Rest APIs.

So you can implement Node Express backend without Sequelize,refer to this post: Build Node.js Rest APIs with Express & MySQL

How do you connect the front and backend?

Hi, we have CORS configuration for the front-end port 8080. Then you just run the React app and open browser with url: http://localhost:8080/ .

It is not possible to connect the front and the back directly for security reasons, you have to throw the data from the back in an api and then consume the api in the front.

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Node.js Event-Driven Programming (With Example)

Event Driven Programming Thumbnail

Node.js has an event loop that takes care of the flow of execution of the tasks, and when a task gets executed it fires the corresponding event to perform a specific action. Creating a Node.js program using multiple events makes the program run synchronously without interrupting the execution. This type of programming is called event-driven programming .

For example: Suppose we are fetching data from an API, and we are waiting to receive data for executing the rest of the programs, once data is obtained we have associated an event that will run and we have programmed that event to show the fetch data in the console. This way we have done event-driven programming to run the code synchronously until we received the required data.

How Event Works in Node.js

When a Node.js script starts its execution, the variables and methods are first initialised and stored in the memory, then listens come into existence and wait for the happening of an event to perform specific actions. This event can be built-in or user-defined. This event-driven nature of Node.js makes it super fast compared to other technologies.

Node.js Event-Driven Programming

Node.js has a module named “event” with a class EventEmitter used for Event-Driven Programming in Node.js.

Importing Event Module

To use this module, it is not required to install it, as it comes built-in with Node.js, you just have to import it.

Below is the syntax to import the event module in Node.js projects:

Note: This tutorial does not cover the event module and its method entirely, Event module has multiple methods which can be used for performing many types of operations, we have a separate tutorial on it, for reading it, click here .

EventEmitter Object

EventEmitter Object is created using EventEmitter class from the “event” module we imported earlier. This EventEmitter Object is used for further Event-Driven Programming. 

Below is the syntax to create an EventEmitter Object:

Here the eventEmitter object created has many methods, such as “on” method to create and bind an event to the handler and an emit method to fire an event.

Creating an Event

Below is the syntax to create an event:

Fire an Event

Below is the syntax to fire an event:

Note: Additionally we can also pass arguments after eventName followed by a comma if the corresponding event takes arguments.

Example of Event-Driven Programming in Node.js

Let’s see an example of the above implementation to understand Node.js event-driven programming better.

In this example, we will stimulate an application that connects two people randomly, it waits for the connection and once connected it triggers an event “match” which shows the message “Match Found” in the console. 

Note : We will not focus on the functionality to connect people, we are just assuming it to understand how event-driven programming works.

Run The Code:

To run the above code, execute the below command in the terminal.

Event-driven programming is a way to write code using events. The events make execution synchronous in a required sequence while increasing the overall execution speed. In this tutorial, we have covered Node.js event-driven programming. Hope you like it.


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