Nestjs Best Practices

Jest best practices, patterns, and API guidance for JavaScript/TypeScript testing. Covers mock design, async testing, matchers, timer mocks, snapshots, modul...

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+.

Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.

Build, optimize, and operate production Next.js apps with best practices for architecture, data fetching, caching, rendering, testing, deployment, and observ...

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

React and Next.js performance optimization patterns. Use when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance. Triggers on tasks involving components, data fetching, bundle optimization, re-render reduction, or server component architecture.