Backend Patterns

WHAT: Production-ready Node.js backend patterns - Express/Fastify setup, layered architecture, middleware, error handling, validation, database integration, authentication, and caching. WHEN: User is building REST APIs, setting up Node.js servers, implementing authentication, integrating databases, adding validation/caching, or structuring backend applications. KEYWORDS: nodejs, node, express, fastify, typescript, api, rest, middleware, authentication, jwt, validation, zod, postgres, mongod

Provides backend architecture patterns (Clean Architecture, Hexagonal, DDD) for building maintainable, testable, and scalable systems with clear layering and...

Next.js App Router best practices — Server Components, data fetching, caching, routing, middleware, metadata, error handling, streaming, Server Actions, and performance optimization for Next.js 14-16+.

Next.js 15/16 App Router patterns — async APIs, caching semantics, Turbopack, Server Components, Route Handlers, and migration from v14

Build reliable backend services with proper error handling, security, and observability.

Build Next.js 15 apps with App Router, server components, caching, auth, and production patterns.