Node.js Tutorial

1. Node.js Introduction

What Node.js is, V8 and libuv conceptually, installing Node, and your first script.

2. Modules & npm

CommonJS vs ES modules, and npm basics: package.json, dependencies, and installing packages.

3. Building APIs with Express

A complete small Express app: routes, middleware, route params, JSON bodies, and error handling.

4. Async Node.js

The event loop in depth, callbacks to Promises to async/await, streams, and EventEmitter.

5. Streams in Depth

Readable, Writable, and Transform streams, backpressure, and a complete file-processing pipeline.

6. Error Handling & Production Patterns

Uncaught exceptions, unhandled rejections, centralized Express error middleware, and graceful shutdown.

7. Performance & Clustering

Using the cluster module for multi-core scaling, profiling basics, and common performance bottlenecks.

8. Testing with Jest

Unit tests, mocking, and Supertest integration tests for an Express route.

9. Node.js Interview Questions

Commonly asked Node.js interview questions with clear, practical answers.