fastify

name	fastify
description	Fastify schema validation, hooks, plugins, serialization. Use when building Fastify apps.

fastify

Build high-performance Node.js APIs with Fastify.

Schema Validation

• JSON Schema for request validation via schema option
• Fastify serializes responses automatically from schema
• Supports Ajv custom validators and formats

Hooks & Plugins

• Request lifecycle hooks: onRequest, preHandler, onSend, onResponse
• Encapsulated plugin system via fastify-plugin
• Decorators to extend Fastify instance

Serialization

• Automatic JSON schema-based serialization
• Custom serializers for non-JSON formats
• Higher throughput than JSON.stringify

TypeScript

• Full TypeScript support with auto-generated types
• Type providers for validation (Zod, TypeBox)
• Strict typing for request/reply

Best Practices

• Encapsulate routes in plugins
• Use pino logger (built-in)
• Content Type Parser for non-JSON bodies
• Testing with fastify.inject() (no supertest needed)
• Compression via @fastify/compress