Node.js is a powerful JavaScript runtime that allows us to run JavaScript outside the browser. It is mainly used to build fast and scalable backend applications.
Before Node.js, JavaScript was only used for frontend development. But Node.js made it possible to build full-stack applications using a single language.
Node.js enables JavaScript to run outside the browser
1. What is Node.js?
Node.js is an open-source, cross-platform runtime environment that executes JavaScript code using the V8 engine.
Basic Example:
console.log("Welcome to Node.js");
Output:
Welcome to Node.js
2. Why Node.js Was Created?
- Run JavaScript outside browser
- Build fast backend services
- Handle multiple users
- Create real-time apps
3. History of Node.js
- Created by Ryan Dahl (2009)
- Uses V8 Engine
- High performance
Node.js is not a programming language. It is a runtime.
4. Features
- Fast
- Non-blocking
- Scalable
- Lightweight
5. Uses
- APIs
- Chat apps
- Streaming
- Real-time apps
6. Companies
- Netflix
- PayPal
- Uber
- Amazon
7. Node.js vs Traditional
Traditional
- Blocking
- Multi-thread
Node.js
- Non-blocking
- Single thread
8. Mistakes
- Thinking it's a language
- Thinking it's a framework
- Using DOM
9. Real Example
Node.js handles thousands of users (like food delivery apps) without slowing down.
Conclusion
Now you understand Node.js basics.
Your journey starts here 🚀
Tags
NodeJS