Fastify REST API

Build high-performance Node.js APIs with Fastify. Uses JSON Schema validation and serialization, plugins and decorators, hooks, and typed routes to get maximum throughput with minimal overhead.

This skill helps you build fast, well-typed Fastify backends. It defines JSON Schema for request validation and response serialization, structures functionality into encapsulated plugins, registers decorators and lifecycle hooks, configures TypeBox or Zod typed routes, and tunes logging and graceful shutdown for production.

When to use

Use when building high-throughput Node.js services with Fastify, defining JSON Schema validation, writing plugins and hooks, or migrating an Express app to Fastify for performance.

Examples

Schema-validated route

Validate and serialize with JSON Schema

Create a Fastify route for creating users with JSON Schema validation on the body and a serialized response schema for speed

Encapsulated plugin

Modularize a feature

Refactor this Fastify app to move database access into an encapsulated plugin registered with a decorator