Node.js - Hello world Application

Creating a simple "Hello, World!" application in Node.js is straightforward.

Follow these steps to set up a basic Node.js server:

1. Install Node.js: Ensure that Node.js is installed on your system. You can download it from the official website: Node.js Downloads

2. Create a Project Directory: Create a new directory for your Node.js project. Open a terminal or command prompt and navigate to the directory where you want to create the project.

3. Initialize the Project: Run the following command to initialize a new Node.js project and create a package.json file:

   npm init -y

4. Create the Server File: Create a file named app.js (or any other preferred name) in your project directory. Open the file in a text editor and add the following code:

   // app.js

   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}/`);
   });
    

5. Run the Server: In the terminal, run the following command to start your Node.js server:

   node app.js

   This will start the server, and you should see the message "Server running at http://127.0.0.1:3000/" in the console.

6. Access the Hello World Page: Open your web browser and navigate to http://127.0.0.1:3000/. You should see the "Hello, World!" message displayed.

Congratulations! You've just created a simple Node.js "Hello, World!" application. This is a basic example to get you started, and from here, you can explore and build more complex applications using the features and modules available in the Node.js ecosystem.