Version: latest (v5.8.x)

Core Documents​

For the full table of contents (TOC), see below. The following list is a subset of the full TOC that detail core Fastify APIs and concepts in order of most likely importance to the reader:

• Server: Documents the core Fastify API. Includes documentation for the factory function and the object returned by the factory function.
• Lifecycle: Explains the Fastify request lifecycle and illustrates where Hooks are available for integrating with it.
• Routes: Details how to register routes with Fastify and how Fastify builds and evaluates the routing trie.
• Request: Details Fastify's request object that is passed into each request handler.
• Reply: Details Fastify's response object available to each request handler.
• Validation and Serialization: Details Fastify's support for validating incoming data and how Fastify serializes data for responses.
• Plugins: Explains Fastify's plugin architecture and API.
• Encapsulation: Explains a core concept upon which all Fastify plugins are built.
• Decorators: Explains the server, request, and response decorator APIs.
• Hooks: Details the API by which Fastify plugins can inject themselves into Fastify's handling of the request lifecycle.

Reference Documentation Table Of Contents​

This table of contents is in alphabetical order.

• Content Type Parser: Documents Fastify's default content type parser and how to add support for new content types.
• Decorators: Explains the server, request, and response decorator APIs.
• Encapsulation: Explains a core concept upon which all Fastify plugins are built.
• Errors: Details how Fastify handles errors and lists the standard set of errors Fastify generates.
• Hooks: Details the API by which Fastify plugins can inject themselves into Fastify's handling of the request lifecycle.
• HTTP2: Details Fastify's HTTP2 support.
• Lifecycle: Explains the Fastify request lifecycle and illustrates where Hooks are available for integrating with it.
• Logging: Details Fastify's included logging and how to customize it.
• Long Term Support: Explains Fastify's long term support (LTS) guarantee and the exceptions possible to the semver contract.
• Middleware: Details Fastify's support for Express.js style middleware.
• Plugins: Explains Fastify's plugin architecture and API.
• Reply: Details Fastify's response object available to each request handler.
• Request: Details Fastify's request object that is passed into each request handler.
• Routes: Details how to register routes with Fastify and how Fastify builds and evaluates the routing trie.
• Server: Documents the core Fastify API. Includes documentation for the factory function and the object returned by the factory function.
• TypeScript: Documents Fastify's TypeScript support and provides recommendations for writing applications in TypeScript that utilize Fastify.
• Validation and Serialization: Details Fastify's support for validating incoming data and how Fastify serializes data for responses.
• Warnings: Details the warnings Fastify emits and how to solve them.