What Is Node.js



Node.js Introduction

 

As an asynchronous event driven JavaScript runtime, Node is designed to build scalable network applications.

·         Node.js is an open source server environment

·         Developed by Ryan Dahl.

·         Node.js runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)

·         Node.js uses JavaScript on the server

·         Build on V8 engine, Chrome’s JavaScript engine.

·         NodeJS eco-system ‘npm’ is the largest in the world for open source libraries.

Node.js Event Loop

Simple Node.js "Hellow World" example.
const http = require('http');
 
const hostname = '127.0.0.1';
const port = 3000;
 
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');
});
 
server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

Advantages of Node.js

·         Node.js offers an easy scalability

·         Easy to learn

·          Node.js is used as a single programming language

·         The support of large and active community

·         Known for offering high performance

·         Offers the freedom to develop apps

Disadvantages of Node.js

·         Application Programming Interface (API) is Not Stable

·         Does not have a Strong Library Support System

·         Asynchronous Programming Model






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