Cool Node Js Examples

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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 towards implementing Isomorphic JavaScript, also called Universal JavaScript. Today, developers can use JavaScript to develop apps, partially or from end to end.

NodeJS Example – SELECT FROM Table

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 is not 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 app examples.

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.

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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 every day, and it does it seamlessly — that’s the number one achievement of the Node.js non-blocking model.

Yet, heavy data load is not 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. As far as performance is concerned, the PayPal team illustrates it with the following chart:. 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,.

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. 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 requests due to its event-based, non-blocking input/output model.

FinTech apps

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 technology to achieve stability and reliability. Yet, as the business grew more popular, eBay had to scale its platform, and scalability is not 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.

Scraping the Web with Node.js

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 frontend 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. The number of active users: 43.6 million .

The year of launch: 2008. The country of launch: USA (Chicago, Illinois). In October 2013, the Groupon engineering team reported that they have moved all their web traffic from a legacy Ruby on Rails app to a brand-new Node JS web app.

Once the team decided to rewrite their web application and transition to a service-oriented architecture, they have been choosing between Python, PHP, and Node.js.

Ecommerce apps

After some profound research, they decided that Node.js must be the optimal solution due to its vibrant community, easy scaling, powerful performance, and NPM (Node.js package manager). According to Sean McCullough at Groupon Engineering,. Groupon will be one of the largest production deploys of Node.js worldwide.

We’re currently serving ~50,000rpm and our overall response times have dropped dramatically. Apparently, for the Groupon team, Node.js became a chance to revive their application, significantly improve its performance, and join a vivid community of Node.js developers and supportive members.

Streaming is rapidly turning into one of the most profitable branches of the entertainment industry.

Node.js is the best choice for FinTech, e-commerce, streaming, networking, and IoT apps considering its benefits.

Similar to eCommerce apps, these platforms have to be able to 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 number of active users: 182 million . 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 backend and frontend under the same language and improve performance and speed.

They opted in favor of Node.js for the back end and React for the front end.

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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,. 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.

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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. Examples of the best-known networking Node.js apps are LinkedIn, Twitter Lite, Medium, and Trello.

The number of active users: 675 million . The year of launch: 2002.

Debugging Node.js in Production

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 is not 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 app. 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,.

Streaming apps

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.

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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. 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.

5 Performance Tips for Node.js Applications

It is 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,. 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 app 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.