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Inside this article we will see how to build a simple web server in node js. Article contains classified information about creating a web server in node programming.

Every application has a way to start it’s own in-built development server. Here, in the same way we will in Node js. To understand this concept we will create a small code snippet in node js and execute into a simple web server of it.

Node JS is an environment where we can deploy and execute javascript based applications. You need to remember that NodeJS is not a framework, and it’s not a programming language. Node.js is mostly used in server-side programming.

To execute application in node js environment, make sure Node & NPM installed in your system

Learn More –

Let’s get started.

What is a Web Server?

A web server is a computer that runs websites. It’s a computer program that distributes web pages as they are requisitioned. The basic objective of the web server is to store, process and deliver web pages to the users.

In Node Js we have two ways to build a web server to run application –

Using http inbuilt module
Using express third party module

We will see both of these to create a web server.

Web Server: Using http inbuilt module

In this we have HTTP and HTTPS, these two inbuilt modules of node js are used to create a simple web server.

Create a folder node-http in your localhost directory. Open this folder into terminal or command prompt.

Next, we need package.json file. Run this given command into terminal

$ npm init -y

The given command will auto generate package.json file with default values. It will look like this –

{
  "name": "node-http",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

Create a file index.js and write this following code into it.

// Importing the http module
const http = require("http")

// Creating server
const server = http.createServer((req, res) => {
    // Sending the response
    res.write("This is the response from the server")
    res.end();
})

// Server listening to port 3000
server.listen((3000), () => {
    console.log("Server is Running");
})

Here,

We can see we have used http module. Started server to listen at 3000 port. Back to terminal and run this command into it.

$ node index.js

Output

URL: http://localhost:3000/

This is the response from the server

Web Server: Using express third party module

Create a folder node-express in your localhost directory. Open this folder into terminal or command prompt.

Next, we need package.json file. Run this given command into terminal

$ npm init -y

The given command will auto generate package.json file with default values.

Let’s install express third party NPM package.

$ npm install express

It installs into application and create a node_modules folder into it.

Open index.js and write this code into it.

// Importing express module
const express = require("express")
const app = express()

// Handling GET / request
app.use("/", (req, res, next) => {
    res.send("This is the express server")
})

// Handling GET /hello request
app.get("/hello", (req, res, next) => {
    res.send("This is the hello response");
})

// Server setup
app.listen(3000, () => {
    console.log("Server is Running")
})

Here,

We can see we have used express module. Started server to listen at 3000 port. Back to terminal and run this command into it.

$ node index.js

Output

URL: http://localhost:3000/

This is the express server

We hope this article helped you to learn How to Build a Simple Web Server with Node js Tutorial in a very detailed way.

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