Node.js is a popular choice for building backend applications for several reasons:

1. JavaScript: Node.js uses JavaScript as its primary programming language, which is a familiar and widely-used language for many developers. This makes it easy to pick up and use for developers who are already familiar with JavaScript, and allows for the frontend and backend of an application to be built with a single language.
2. Asynchrony: Node.js uses an event-driven, non-blocking I/O model, which makes it efficient for building scalable, real-time applications. This allows Node.js to handle multiple requests concurrently, which can be particularly useful for building real-time applications like chat or gaming.
3. Large ecosystem: Node.js has a large, active community and a vast ecosystem of libraries and frameworks that make it easy to build and deploy applications. This includes popular libraries like Express.js for building web applications, and popular frameworks like LoopBack for building API-driven applications.
4. Performance: Node.js is known for its performance and ability to handle large numbers of concurrent connections. This makes it a good choice for building high-performance applications that need to handle a lot of traffic.

Overall, Node.js is a powerful and flexible platform that is well-suited for building a wide variety of backend applications.

What are the Node.JS Pros & Cons ?

Here are some pros and cons of using Node.js for building backend applications:

Pros	Cons
JavaScript is a familiar and widely-used language for many developers	Single-threaded, which can be a limitation if your application requires heavy CPU processing
Event-driven, non-blocking I/O model is efficient for building scalable, real-time applications	Asynchrony can be difficult if you are not familiar with asynchronous programming
Large, active community and a vast ecosystem of libraries and frameworks make it easy to build and deploy applications	May not have built-in support for certain features that are commonly found in other backend platforms
Known for its performance and ability to handle large numbers of concurrent connections, making it a good choice for high-performance applications

Types of Node.js Framework

There are many types of frameworks available for building backend applications with Node.js. Some popular options include:

1. Express.js: Express.js is a minimalist web framework for Node.js that provides a set of tools for building web and mobile applications. It is lightweight and flexible, making it easy to build simple APIs or more complex web applications.
2. LoopBack: LoopBack is a powerful framework for building APIs and microservices with Node.js. It provides a set of tools for creating and exposing APIs, connecting to databases and other data sources, and handling authentication and authorization.
3. Koa.js: Koa.js is a next-generation web framework for Node.js that is designed to be smaller, more expressive, and more robust than Express.js. It uses async functions and middleware to make it easy to build APIs and web applications.
4. Hapi.js: Hapi.js is a powerful, enterprise-grade framework for building applications and services with Node.js. It provides a rich set of features for building APIs, handling requests and responses, and managing plugins and integrations.
5. Nest.js: Nest.js is a progressive Node.js framework for building efficient and scalable server-side applications. It is built on top of Express.js and uses modern JavaScript features like decorators and async/await.

Which Big Companies Uses Node.js as Backend?

Node.js is a popular choice for building backend applications, and is used by a wide range of companies and organizations. Some examples of companies and organizations that use Node.js as a backend include:

Company/Organization	Description
Netflix	Uses Node.js to build and maintain its web platform, which serves millions of users
Uber	Uses Node.js to build and maintain its web and mobile applications, used by millions
PayPal	Uses Node.js to build and maintain its web and mobile applications, used by millions
NASA	Uses Node.js to build and maintain its web applications, used by scientists and researchers
eBay	Uses Node.js to build and maintain its web and mobile applications, used by millions

 

Advantages of Node.js

Advantage	Description
JavaScript is a familiar and widely-used language for many developers	Node.js uses JavaScript as its primary programming language, which is familiar to many developers and allows for the frontend and backend of an application to be built with a single language.
Event-driven, non-blocking I/O model is efficient for building scalable, real-time applications	Node.js’s event-driven, non-blocking I/O model allows it to handle multiple requests concurrently, making it efficient for building real-time applications like chat or gaming.
Large, active community and a vast ecosystem of libraries and frameworks make it easy to build and deploy	Node.js has a large, active community and a vast ecosystem of libraries and frameworks that make it easy to build and deploy applications. This includes popular libraries like Express.js for building web applications, and popular frameworks like LoopBack for building API-driven applications.
Known for its performance and ability to handle large numbers of concurrent connections	Node.js is known for its performance and ability to handle large numbers of concurrent connections, making it a good choice for building high-performance applications that need to handle a lot of traffic.
Designed to be highly scalable	Node.js is designed to be highly scalable, making it a good choice for building applications that need to handle a lot of traffic or data.
Suitable for building microservices	Node.js is well-suited for building microservices, which are small, independent services that can be composed to build larger applications. This makes it a good choice for building flexible and scalable applications.
Easy to learn, particularly for developers who are already familiar with JavaScript	Node.js is relatively easy to learn, particularly for developers who are already familiar with JavaScript. This makes it a good choice for developers who are new to backend development or want to get up and running quickly.