NodeJS

This repo documents my Node.js learning journey, covering fundamentals, backend development, npm, Express.js, databases, and real-world projects. I'll be building and sharing hands-on exercises, REST APIs, and more. Stay tuned for updates, and feel free to explore or contribute!

What is Node.js?

Node.js is an open-source, cross-platform runtime environment that allows developers to run JavaScript code outside of a web browser. It is built on Chrome's V8 JavaScript engine and is widely used for building scalable network applications, web servers, and backend services.

Key Features of Node.js

• Asynchronous and Event-Driven: Handles multiple operations concurrently without blocking execution.
• Non-Blocking I/O: Efficiently manages operations like file system access, database calls, and networking.
• Cross-Platform: Works on Windows, macOS, and Linux.
• Package Management (npm): Comes with Node Package Manager (npm) for managing dependencies.
• Fast Execution: Uses the V8 engine for high-speed JavaScript execution.

---

How to Install Node.js on Your PC

Step 1: Download Node.js

1. Visit the official Node.js download page.
2. You will see two versions:
   • LTS (Long-Term Support): Recommended for most users.
   • Current (Latest Version): Includes the latest features but may not be stable for production.
3. Download the appropriate version based on your operating system (Windows, macOS, or Linux).

Step 2: Install Node.js on Windows

1. Open the downloaded .msi installer.
2. Follow the installation wizard:
   • Click Next to proceed.
   • Accept the License Agreement.
   • Choose the installation directory (default is recommended).
   • Select components (keep default selections).
   • Click Install and wait for the process to complete.
3. Once installed, restart your computer (optional but recommended).

Step 3: Verify the Installation

1. Open Command Prompt (cmd) or PowerShell.
2. Run the following command to check the installed Node.js version:

   node -v

   If installed correctly, it will display the Node.js version.
3. Verify npm (Node Package Manager) by running:

   npm -v

   This will show the npm version, confirming that it is installed with Node.js.

Step 4: Install Node.js on macOS & Linux

1. Open Terminal and run the following command:

   curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
   sudo apt-get install -y nodejs

   For macOS, you can install Node.js via Homebrew:

   brew install node

2. After installation, verify using:

   node -v
   npm -v

---

Getting Started with Node.js

Now that Node.js is installed, you can start writing JavaScript code!

1. Create a new file named app.js and add the following code:

   console.log('Hello, Node.js!');

2. Run the script using:

   node app.js

   This should output:

   Hello, Node.js!

Next Steps

• Learn about npm and install packages: npm install express
• Explore frameworks like Express.js
• Build a simple HTTP server using Node.js

Happy Coding! 🚀