Fastify

This gives you production-ready Fastify patterns in TypeScript: schema-first validation with Zod or TypeBox type providers, plugin encapsulation for routes and middleware, error handling, security hardening with Helmet and CORS, and testing with inject. The quick start walks you through creating an instance, adding a type provider, registering plugins, and setting up error handlers. It's opinionated about avoiding Express-style middleware chaos by leaning into Fastify's schema validation and plugin architecture. The decision trees helpfully compare Zod versus TypeBox (use Zod if you're already standardized on it, TypeBox for OpenAPI generation) and explain when you'd pick Fastify over Express. Good for teams building high-performance APIs who want type safety and validation to stay in sync without duplicating schemas.