MCPInstall

fastify-best-practices

by ilteooodBackend & APIs

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.

Installs
520
Last 24h
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Security
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/ilteoood/harness --skill fastify-best-practices
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads fastify-best-practices automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

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:

import Fastify from 'fastify'

const app = Fastify({ logger: true })

app.get('/health', async (request, reply) => {
  return { status: 'ok' }
})

const start = async () => {
  await app.listen({ port: 3000, host: '0.0.0.0' })
}
start()

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 hooks support async functions
  • Minimal dependencies: Prefer Fastify's built-in features and official plugins

FAQ

What does the fastify-best-practices skill do?

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.

How do I install fastify-best-practices?

Run npx skills add https://github.com/ilteoood/harness --skill fastify-best-practices in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/fastify-best-practices/ (personal) or .claude/skills/fastify-best-practices/ (project).

Which AI agents can use fastify-best-practices?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is fastify-best-practices safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains fastify-best-practices?

It is published by ilteoood in ilteoood/harness. It has 520 recorded installs.

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