NODE Tutorial



Introduction To Node


🌐 Introduction to Node.js

Node.js is a powerful, open-source runtime environment that allows you to run JavaScript code outside the browser β€” primarily on the server. It's built on Chrome’s V8 JavaScript engine and is designed to build scalable network applications.

πŸ’‘ Quick Fact:

Node.js is not a programming language or a framework β€” it's a runtime environment for executing JavaScript on the server side.

πŸš€ Why Node.js?

  • βœ… Fast execution using the V8 engine.
  • βœ… Non-blocking, event-driven architecture.
  • βœ… Single programming language for frontend and backend (JavaScript).
  • βœ… Rich ecosystem (NPM) for reusable libraries and packages.

βš™οΈ How Node.js Works

Node.js uses an event-driven, non-blocking I/O model. This means it can handle multiple requests at once without waiting for one to complete before starting another.

 // Example: Basic Node.js HTTP server const http = require('http'); const server = http.createServer((req, res) => { res.end('Hello from Node.js!'); }); server.listen(3000, () => { console.log('Server running on port 3000'); }); 
Explanation: This creates a simple HTTP server that responds with β€œHello from Node.js!” on visiting http://localhost:3000.

πŸ“¦ What is NPM?

NPM (Node Package Manager) is a tool bundled with Node.js. It lets you install open-source packages (libraries or tools) easily.

 npm install express 

This command installs the popular Express framework, which helps build web applications faster using Node.js.

πŸ“ Setting Up Node.js

  1. Go to nodejs.org and download the LTS version.
  2. Install it (includes both Node and NPM).
  3. Verify installation using the following commands:
 node -v npm -v 

πŸ›  Pro Tip:

Use VS Code as your code editor and install the "Node.js Extension Pack" for better development experience.

πŸ”š Conclusion

Node.js is a game changer for JavaScript developers. It allows you to build fast, scalable, and real-time server-side applications with ease. As you move forward, you'll explore frameworks like Express.js, build APIs, and connect with databases.

βœ… Next Step:

Learn about Node Modules and how to structure a Node.js project.


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