Step 1:

Write npm init command in your terminal.

Step 2:

Install Express.js by running the following command in your terminal.

npm i express

Step 3:

Create a new file called app.js, this is going to be the entry point of our application. Add the following codes in app.js file.

const express = require( "express" );

const app = express( );
const PORT = 4000;

app.listen( PORT, ( ) => { 
        console.log(`Server is working on ${PORT}`);
    }
);

Step 4:

Run the server by running node app.js command in your terminal.

Output: