Node.js — Introduction
What is Node.js?
Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.
// It's just JavaScript!
console.log('Hello from Node.js!');
console.log(process.version);
console.log(process.platform);
History
- Created by Ryan Dahl in 2009
- Built on Google's V8 engine
- Uses event-driven, non-blocking I/O
- npm launched in 2010
Architecture
Application
↓
Node.js Bindings
↓
V8 Engine + libuv
↓
Operating System
Key Features
| Feature | Description |
|---|---|
| V8 Engine | Fast JavaScript execution |
| Event Loop | Non-blocking I/O |
| npm | Package manager |
| Cross-platform | Windows, macOS, Linux |
| Built-in modules | fs, http, path, etc. |
When to Use Node.js
- REST APIs and microservices
- Real-time applications (chat, gaming)
- Streaming applications
- IoT applications
- Single Page Applications (backend)
When NOT to Use Node.js
- CPU-intensive tasks (use worker threads)
- Heavy mathematical computations
- Applications requiring blocking I/O
Mini Practice
- Check your Node.js version
- Run a simple script
- Explore process object
- Use console.log for output
Up Next
Continue with Get Started — setting up Node.js.
Related Topics
Frequently Asked Questions about Introduction
What is Introduction in Node.js?
Introduction is a fundamental concept in Node.js. This lesson explains it step by step with clear examples, making it easy for beginners to understand.
How do I learn Introduction?
Start by reading the explanation above, then try the code examples. Practice by modifying the examples and experimenting with different values. Hands-on practice is the best way to learn Introduction.
Why is Introduction important in Node.js?
Introduction is essential for Node.js development. Understanding this concept will help you write better code and solve real-world problems more effectively.