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What is Node.js?

JavaScript runtime built on Chrome's V8 engine. Run JavaScript on the server — non-blocking, event-driven, handles thousands of concurrent connections.

Ryan Dahl2009V8 Enginenpm EcosystemMIT License

🔄 Node.js Event Loop Architecture

📋 How Node.js Handles a Request

📨Receive Request

Client sends HTTP request → Node.js receives it on the single thread

🗺️Parse & Route

Express parses URL, method, headers, body → Match to correct route handler

🔐Middleware Chain

Run middleware: CORS check → Auth check (JWT) → Rate limit → Body validation

⚡Async I/O

DB query / file read / API call → Pass to libuv thread pool → Event loop continues

🔄Callback / Promise

When I/O completes → Callback pushed to event queue → Executed when call stack empty

📤Build Response

Format data as JSON → Set headers (Content-Type, CORS, Cache-Control)

✅Send Response

res.json(data) → Node streams response back to client

🛠️ Popular Frameworks & Libraries

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Express.js

Minimalist, most popular. Great ecosystem, flexible, easy to learn. Industry standard.

Use for: REST API, Web apps

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Fastify

Fastest Node.js framework. Built-in schema validation, TypeScript-first, JSON serialization.

Use for: High-performance APIs

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NestJS

Angular-inspired structure. TypeScript, Dependency Injection, great for large teams.

Use for: Enterprise applications

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Hono

Ultra-fast, ultra-lightweight. Works on Edge, Bun, Deno, Cloudflare Workers.

Use for: Edge/serverless APIs

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Socket.io

Real-time bidirectional event-based communication. WebSocket with fallbacks.

Use for: Chat, live updates

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Prisma ORM

Type-safe database client. Auto-generates TypeScript types from schema. Migration tools.

Use for: Any DB with Node.js

💡 Common Use Cases

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REST API

Backend for web/mobile apps. JSON responses, authentication, CRUD operations.

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GraphQL API

Single endpoint, client specifies exact data needed. Great for complex data requirements.

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Real-time Apps

Chat, live notifications, collaborative tools, real-time dashboards via WebSocket.

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Microservices

Small independent services. Each handles one concern, communicate via HTTP/Message Queue.

⌨️

CLI Tools

Build command-line scripts. npm packages, code generators, deployment scripts.

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BFF Pattern

Backend for Frontend — Node aggregates multiple APIs/services for each client type.

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