fastify-best-practices

Error at any stage → onError hooks → error handler → onSend → response → onResponse.

Project convention: use FastifyPluginCallback + done() (avoids require-await lint errors).

Load the relevant file when you need detailed API information:

Fastify 5 best practices, API reference, and patterns for routes, plugins, hooks, validation, error handling, and TypeScript. Use when: (1) writing new Fastify routes, plugins, or hooks, (2) looking up Fastify API signatures or options, (3) debugging Fastify issues (lifecycle, encapsulation, validation, plugin timeout), (4) reviewing Fastify code for anti-patterns. Triggers: 'add a route', 'create plugin', 'Fastify hook', 'validation schema', 'Fastify error', 'setErrorHandler', 'fastify-plugin'. Source: jgamaraalv/ts-dev-kit.