Fastify Plugin Guide

A guide to extending Fastify with plugins for modular, encapsulated, and performant API development.

Usage

Ask about Fastify plugins, decorators, hooks, encapsulation, or modular API architecture.

Examples

• "Create a Fastify plugin for JWT authentication"
• "How does Fastify's encapsulation context work?"
• "Build a database plugin with connection pooling"

Guidelines

• Use fastify-plugin for plugins that should share the parent context
• Leverage decorators to attach utilities to the Fastify instance
• Use hooks for cross-cutting concerns like logging and auth
• Register plugins with prefix for route namespacing
• Use JSON Schema for request/response validation