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Fast and low overhead web framework for Node.js. Docs are split into Guides (tutorial-style) and Reference (formal API docs). Covers getting started, plugins, hooks, validation, serialization, and TypeScript.
Quick-start tutorial covering installation, first server, routing, plugins, and logging.
Factory function and server instance API documentation — the core of Fastify.
Complete route configuration, URL parameters, route constraints, and schema validation.
How to create, register, and encapsulate plugins — the foundation of Fastify's architecture.
Breaking changes and migration path from Fastify v4 to v5.