fastifylisted

# Fastify Skill ## When to activate - Building a REST API with Fastify - Migrating an Express service to Fastify for performance gains - Adding schema validation, JWT auth, or Swagger docs to a Fastify app - Setting up the plugin/encapsulation model for a modular Fastify service - Writing tests with `fastify.inject()` (no live HTTP server) - Any task where the user references `fastify`, `@fastify/*`, or `fastify-plugin` ## When NOT to use - Edge deployments — use the hono skill (Cloudflare Workers, Deno Deploy) - Full-stack framework with SSR — use the nextjs or remix skill - The user explicitly wants Express middleware ecosystem compatibility ## Instructions ### Project setup and structure ``` Set up a production-ready Fastify project with TypeScript. Language: TypeScript Database: [PostgreSQL / MongoDB / none] Auth: [JWT / none] Swagger: [yes / no] Directory structure: src/ app.ts ← Fastify instance + plugin registration (no listen here) server.ts ← entry point (listen + graceful shutdown) plugins/ sensible.ts ← @fastify/sensible for standard HTTP errors jwt.ts ← fastify-jwt plugin (scoped auth decorator) swagger.ts ← @fastify/swagger + @fastify/swagger-ui routes/ index.ts ← route aggregator users/ index.ts ← users route definitions with JSON Schema schema.ts ← TypeBox schemas for request/response hooks/ auth.ts ← onRequest hook for JWT verification types/