Setting up HTTP Server with Express.js

To create an HTTP server using Express.js, follow these steps:

1. Install Express.js

Make sure you have Node.js installed. Then, create a new project and install Express:

    mkdir my-express-server

    cd my-express-server

    npm init -y

    npm install express

2. Create the Server

Create a file called server.js and add the following code:

    // Import Express

    const express = require('express');

    // Create an Express application

    const app = express();

    // Define a port

    const PORT = 3000;

    // Define a route

    app.get('/', (req, res) => {

    res.send('Hello, World!');

    });

    // Start the server

    app.listen(PORT, () => {

    console.log(`Server is running on http://localhost:${PORT}`);

    });

Or

  // creating a http server with express js

  // - using conditional statement

  var express = require("express");

  var app = express();

  app.listen(3000,(err)=>{

    if(err){

      console.log("error!!..");

      return;

    }else{

      console.log("port is running");

    }

  })

3. Run the Server

Run the server using Node.js:

    node server.js

4. Test the Server

Open a browser or a tool like Postman, and navigate to http://localhost:3000. You should see "Hello, World!" displayed.