creating an HTTP server using Express.js in Node.js

• Start by creating a new directory for your project and navigate to it in your terminal.

• Initialize a new Node.js project by running the following command:

npm init -y

• Install Express.js as a dependency by running the following command:

npm install express

• Create a new file, for example server.js, and open it in a text editor.

• In server.js, import Express and create an instance of the Express application:

const express = require('express');
const app = express();

• Define a route that will handle incoming HTTP requests. For example, let's create a route that responds with "Hello, World!" when someone accesses the root URL ("/"):

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

• Set up the server to listen on a specific port. For instance, let's listen on port 8000:

const PORT = 8000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

• Save the file.

• In your terminal, run the following command to start the server:

node server.js

• You should see the message "Server is running on port 8000" in the console.

  Now, you can open a web browser and navigate to http://localhost:8000 to see the "Hello, World!" message.

• You can add more routes and functionality to your Express server as needed. This example provides a basic starting point for creating an HTTP server using Express.js.