Agent skill · software engineering · mcollina
fastify-best-practices
Guides development of Fastify Node.js backend servers and REST APIs using TypeScript or JavaScript. Use when building, configuring, or debugging a Fastify application — including defining routes, implementing plugins, setting up JSON Schema validation, handling errors, optimising performance, managing authentication, configuring CORS and security headers, integrating databases, working with WebSockets, and deploying to production. Covers the full Fastify request lifecycle (hooks, serialization, logging with Pino) and TypeScript integration via strip types. Trigger terms: Fastify, Node.js server, REST API, API routes, backend framework, fastify.config, server.ts, app.ts.
Why this skill is useful
Provides specific patterns and practices for developing Fastify applications that the AI wouldn't reliably generate on its own.
What it needs
About 2k tokens when loaded. Last updated 2026-08-03. 1,894 stars on the source repository.
What this skill does
When to use Use this skill when you need to: Develop backend applications using Fastify Implement Fastify plugins and route handlers Get guidance on Fastify architecture and patterns Use TypeScript with Fastify (strip types) Implement testing with Fastify's inject method Configure validation, serialization, and error handling Quick Start A minimal, runnable Fastify server to get started immediately: Recommended Reading Order for Common Scenarios New to Fastify? Start with plugins.md → routes.md → schemas.md Adding authentication: plugins.md → hooks.md → authentication.md Improving performance: schemas.md → serialization.md → performance.md Setting up testing: routes.md → testing.md Going to production: logging.md → configuration.md → deployment.md How to use Read individual rule files for detailed explanations and code examples: rules/plugins.md - Plugin development and encapsulation rules/routes.md - Route organization and handlers rules/schemas.md - JSON Schema validation rules/error-handling.md - Error handling patterns rules/hooks.md - Hooks and request lifecycle rules/authentication.md - Authentication and authorization rules/testing.md - Testing with inject() rules/performance.md - Performance optimization rules/logging.md - Logging with Pino rules/typescript.md - TypeScript integration rules/decorators.md - Decorators and extensions rules/content-type.md - Content type parsing rules/serialization.md - Response serialization rules/cors-security.md - CORS and security headers rules/websockets.md - WebSocket support rules/database.md - Database integration patterns rules/configuration.md - Application configuration rules/deployment.md - Production deployment rules/http-proxy.md - HTTP proxying and reply.from() Core Principles Encapsulation: Fastify's plugin system provides automatic encapsulation Schema-first: Define schemas for validation and serialization Performance: Fastify is optimized for speed; use its features correctly Async/await: All handlers and hook …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills mcollina/fastify