Creating an HTTP Server in Node.js: A Beginner's Guide

 To create an HTTP server in Node.js, you can use the built-in http module. Here's a simple example:

const http = require('http');

// Create the server
const server = http.createServer((request, response) => {
  // Set the response header
  response.setHeader('Content-Type', 'text/plain');
  
  // Set the response content
  response.write('Hello, World!');
  
  // End the response
  response.end();
});

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

In the above example, we use the createServer method of the http module to create an HTTP server. It takes a callback function that will be called whenever a request is received. The callback function takes two parameters: request represents the incoming request, and response represents the outgoing response.

Inside the callback function, you can set the response headers using the setHeader method of the response object. In this example, we set the Content-Type header to text/plain.

You can send the response content using the write method of the response object. In this case, we simply send the string "Hello, World!".

Finally, we end the response using the end method of the response object.

To start the server, we call the listen method on the server object. It takes the port number and the hostname (optional) as arguments. In this example, the server listens on port 3000 of the localhost. The callback function passed to listen is called once the server starts, and we log a message to indicate that the server is running.

You can run this code using Node.js, and it will create an HTTP server that listens on http://localhost:3000 and responds with "Hello, World!" for every request it receives.