Fastify Snippets & Code Examples

What is Fastify?

Fast and low overhead web framework, focused on providing the best developer experience.

Use the snippets below to quickly add common functionality to your Fastify applications. All snippets are production-ready and can be copied directly into your project.

Popular Features

Fastify Server
WebSocket Server
JWT Authentication
API Key Authentication
Request ID
Response Time

Libraries

Server implementations for Fastify applications

3 snippets

Fastify Server

Production-ready Fastify HTTP server with graceful shutdown

WebSocket Server

Real-time WebSocket server with connection management

GraphQL Server (Mercurius)

GraphQL API with Mercurius adapter

Middleware

Reusable Fastify middleware and hooks

8 snippets

JWT Authentication

JWT middleware with role-based access control

API Key Authentication

API key auth for service-to-service communication

CORS Configuration

Cross-origin resource sharing with environment config

Utilities

Standalone utility functions for Fastify applications

3 snippets

Request ID

Unique ID for request tracing

Response Time

Add X-Response-Time header and metrics

Compression

Response compression with @fastify/compress

Documentation

API documentation and OpenAPI tools

1 snippets

Swagger/OpenAPI

OpenAPI documentation with Swagger UI

Getting Started

Install the Hanma CLI to add snippets to your project:

npx hanma add  --framework fastify

Or browse the categories above to find the snippet you need.