Node.js is an open-source, cross-platform runtime environment that enables JavaScript for server-side application development.

Install NodeJs-

You can download and install Node.js from its official website: https://nodejs.org/

Node.js Application Create-

• create new folder for the project.
• in your folder first create example.js file (You can use diffrent name no issue).
• open your file and write javascript code & save file.

console.log("Hello, World!");
it print Hello Word! on your cansole.

Run Code-

open your terminal and go in folder using cd command & run your application using this command.

node example.js

Node Package Manager-

Use this command for package manager

npm init

Creating a Simple HTTP Server-

it contain 3 parts

Step 1.  Import required modules

var http = require("http");  

Step 2. Create server

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello, World!\n');
});

server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});

Step 3.  Read request and return response (example.js)

First Combine Step1+Step2 and run code for request and response.

const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello, World!\n');
});

server.listen(3000, () => {
  console.log('Server running at http://localhost:3000/');
});

Run your code using this command

node example.js

Now server is started

open it op browser

Open http://localhost:3000/ in any browser. You will see the following result.