How to build web server in Node.js? Node.js HTTP module

Node.js / July 18, 2022 / TopCode / 0

Introduction:

When you view a website in your browser, you are making a request to another computer on the internet, which then provides you a webpage as a response. That computer which is serving your requests is a Web Server. A web server receives HTTP requests from a client and provides an HTTP response. Building a web server in Node is pretty easy. With help of Node.js core module which is http module, you can build a simple and blazing fast web server.

Building a simple HTTP server in Nodejs

Let’s create a basic http server which returns “Hello World” to the client.

To build http server first you need to import http module. Here we are using built-in require() function. The http module provides createServer() function to create the server. http.createServer() function takes a function as an argument.

Next step is to bind our http server to some port. To do so we have to call listen() function which takes an integer argument which defines the port number.

const http = require('http');

const requestListener = function (req, res) {
  res.writeHead(200);
  res.end('Hello World');
}

const server = http.createServer(requestListener);
server.listen(8080);

Let’s save the above code snippet as server.js and run it with following command.

node server.js

Now open following url to access your basic web server.

http://localhost:8080

You will get “Hello World” as response of the http request. If we look at the requestListener function which takes two argument one is request object and another is response object. The request object contains basic information about the http request such as url, method, query params, path params, ip address etc.

That’s all about the basic http server in Node.js. Almost every application framework like Express, Koa, Hapi, Restify, Fastify and many more uses http server in it’s core. So create your own HTTP server and run your server like a Boss😎

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