Fastify questions are easy to answer from stale memory or Express-centric assumptions. Use this skill to ground answers in the official Fastify documentation and return the closest authoritative page instead of generic Node.js HTTP advice.

When to Use

Use this skill when the request is about:

Fastify concepts, architecture, plugins, and encapsulation
Server creation, configuration, routing, and the request lifecycle
Request and reply objects, hooks, decorators, and error handling
JSON Schema validation, serialization, and content-type parsing
Plugins, fastify-plugin, encapsulation scopes, and the @fastify/* ecosystem
Logging, middleware (Express-style), HTTP/2, and TypeScript support
Testing with inject(), serverless deployment, and production recommendations
Migration between Fastify major versions

Do not use this skill for:

fastify-docs

When to Use