What is Node.JS?

What is Node.JS?

What is Node.js?

Node.js is a multiplatform open source execution environment used for the development of server-side web applications. Node.js applications are written in JavaScript and can run on a wide variety of operating systems. It is based on an event-oriented architecture and a non-blocking I / O API designed to optimize the performance and scalability of an application to web applications in real time. Over a long period of time, the framework available for web development was based on a stateless model.

A stateless model is where the data generated in a session (such as information about user settings and events) are not preserved for use in the next session with that user. It takes a lot of work to keep the session information between requests a user But with Node.js, finally there is a way for web applications to have bi-directional connections in real time, in which both the client and the server can initiate the communication, allowing them to exchange data freely.

How does it work?

First, like other languages, the node comes with packages and modules. These are function libraries that we can import from npm (packet manager node) for our code and usage. If you have the node installed on your computer, then you already have some basic modules installed. This is how we created a simple server, but we’ll see it later. If you are familiar with JavaScript, you will know that it is asynchronous and unique.

The only thread is the event loop that is responsible for executing all functions and requests. Asynchronous behavior is extremely important when the node is used because it ensures that the cycle of events is never blocked by a synchronous function. Although there is only one cycle of events, when a request is made, the cycle passes the request to an asynchronous function that the job When this function is completed and a response is returned, you can go to the event loop so that it is done by return call and sent to the user.

Parts of Node.js

If the functions were synchronous, the event loop would be blocked with a request and response from the clients, and all the others would have to wait until the client was ready. Due to the asynchronous nature of JavaScript, applications that use the node can manipulate many requests passing at the same time. This means that when programming in Node.js, it is important to always bear in mind that the functions that are being written are not synchronous. It is also very important to detect errors on the server before they are returned to the client. This prevents errors from reaching the event loop, which could cause blockages in the program and all clients would suffer.

Why is Node.js popular?

Node.js is widely used due to its large open-source ecosystem, active and based on javascript., Javascript and Python are advancing rapidly, while languages like PHP and C # are losing interest gradually. In the end, JavaScript loses only for Python and remains in second place among the list of most desired programming languages. Both languages compete with each other, leaving others behind. And in the case of the most popular frames, Node.js ranks first.

Features of Node.js

These are some of the key features that make Node.js the first choice for software architects:

  • Asynchronous and event-driven: all genus API within the library area unit asynchronous, that is, non-blocking. Basically, it implies that a server supported Node.js ne’er expects Associate in Nursing API to come back knowledge. The server goes to following API once line it, and a Node.js event notification engine helps the server get a response from the previous API decision.Very fast: it is being built in the JavaScript Chrome V8 engine, the Node.js library is very fast in code execution
  • With a single thread, but highly scalable: js uses a single-threaded model with an events loop. Node.js uses a single chained program, and the same program can provide service for a much larger number of requests than traditional servers, such as the Apache HTTP server.
  • No buffering: Node.js applications never store buffer data These applications simply display the data in parts.

Advantages of Node.js

  • js is an open source framework under the MIT license. (The MIT license is a free software license of the Massachusetts Institute of Technology (MIT)).
  • Use JavaScript to create the entire server-side application. Other modules may be included as required by an application.
  • Asynchronous by default. So it runs faster than other frames
  • Cross-platform framework running on Windows, MAC or Linux