fastify-patterns

The best way to structure a Fastify API is by using schema-first development with Zod schemas to enforce data validation and serialization, alongside a plugin architecture for reusable components like database connections and authentication.

You can set up global error handling in a Fastify Node.js application by implementing a global error handler pattern that intercepts errors and returns consistent error responses across all routes.

Yes, you can use Zod for schema definitions and generate Swagger documentation by converting Zod schemas to JSON schemas using zod-to-json-schema, which integrates with @fastify/swagger for automatic OpenAPI spec generation.

You can unit test Fastify routes using Vitest, which provides patterns for injecting mock HTTP requests into your route handlers to verify responses and validate schema behavior without starting a live server.

Yes, this approach is designed specifically for Fastify 5.x, providing structured patterns for routing, decorators, and plugin registration to ensure maintainable and performant API development in the latest version.

You register database connections and JWT authentication as reusable Fastify plugins by encapsulating Prisma client setup and @fastify/jwt configuration within decorated plugin scopes, allowing clean separation and easy route integration.