Helloo!! everyone, lets start build Rest Apis in our very first nodejs app.
Install and Setup Nodejs in your system from here 🔗Link
Open cmd terminal and write

$ mkdir test-app
$ cd test-app
$ npm init

and select your main file name as app.js
this will create the 📄package.json. Now in the root directory create a file name 📄app.js , now we need to install express

$ npm install express --save

now in app.js

const express = require('express');
const app = express(); // we will use this app to define routes, port, Middleware everything

//route
app.get('/', (req,res) =>{
    res.send('Hello World');
});

// define port for hosting
app.listen(3004,()=>{
  console.log("Port running on 3004")
})

now in terminal run command npm app.js