NodeJS Hello World

Node.js is a powerful server-side JavaScript runtime that allows developers to build fast and scalable web applications. In this tutorial, we will guide you through the process of creating a simple "Hello, World!" application using Node.js.

Step 1: Install Node.js
Before you can start building Node.js applications, you need to install Node.js on your computer. To do this, visit the official Node.js website (https://nodejs.org/) and download the appropriate version for your operating system. The installation process is straightforward and usually involves clicking through a series of prompts.

Step 2: Create a new Node.js project
Once Node.js is installed on your computer, you can create a new Node.js project by opening a terminal window and navigating to the directory where you want to create your project. To do this, run the following command:

mkdir hello-world-nodejs
cd hello-world-nodejs

Step 3: Create a new JavaScript file
In the hello-world-nodejs directory, create a new JavaScript file called app.js. This file will contain the code for our "Hello, World!" application. To create a new JavaScript file, run the following command:

touch app.js

Step 4: Write the code for the application
Open the app.js file in your favorite text editor and add the following code:

const http = require('http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!n');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

This code creates a simple HTTP server that listens on port 3000 and responds with "Hello, World!" when a request is made.

Step 5: Start the application
To start the application, run the following command in the terminal:

node app.js

You should see the message "Server running at http://127.0.0.1:3000/" in the terminal. This means that the application is running and ready to accept requests.

Step 6: Test the application
Open a web browser and navigate to http://127.0.0.1:3000/. You should see the message "Hello, World!" displayed in the browser. Congratulations, you have successfully created a "Hello, World!" application using Node.js!

In this tutorial, we walked you through the process of creating a simple "Hello, World!" application using Node.js. Node.js is a versatile and powerful platform for building web applications, and we encourage you to explore its capabilities further. Happy coding!