nodejs-backend-patterns

# Node.js Backend Patterns Comprehensive guidance for building scalable, maintainable, and production-ready Node.js backend applications with modern frameworks, architectural patterns, and best practices. ## When to Use This Skill - Building REST APIs or GraphQL servers - Creating microservices with Node.js - Implementing authentication and authorization - Designing scalable backend architectures - Setting up middleware and error handling - Integrating databases (SQL and NoSQL) - Building real-time applications with WebSockets - Implementing background job processing ## Core Frameworks ### Express.js - Minimalist Framework **Basic Setup:** ```typescript import express, { Request, Response, NextFunction } from "express"; import helmet from "helmet"; import cors from "cors"; import compression from "compression"; const app = express(); // Security middleware app.use(helmet()); app.use(cors({ origin: process.env.ALLOWED_ORIGINS?.split(",") })); app.use(compression()); // Body parsing app.use(express.json({ limit: "10mb" })); app.use(express.urlencoded({ extended: true, limit: "10mb" })); // Request logging app.use((req: Request, res: Response, next: NextFunction) => { console.log(`${req.method} ${req.path}`); next(); }); const PORT = process.env.PORT || 3000; app.listen(PORT, () => { console.log(`Server running on port ${PORT}`); }); ``` ### Fastify - High Performance Framework **Basic Setup:** ```typescript import Fastify from "fastify"; import helmet from ...