Authentication in Fastify

Overview

This page contains 5 code snippets for implementing Authentication in Fastify. Each snippet is production-ready and can be copy-pasted directly into your project.

Available Snippets

GraphQL Server (Mercurius)

GraphQL API with Mercurius adapter

npx hanma add fastify-graphql-server --framework fastify

Mercurius integration
GraphQL subscriptions support
GraphiQL playground in development

JWT Authentication

JWT middleware with role-based access control

npx hanma add fastify-jwt --framework fastify

JWT verification via @fastify/jwt
Role-based access control
Token generation helpers

API Key Authentication

API key auth for service-to-service communication

npx hanma add fastify-api-key --framework fastify

Header-based API key
Multiple key support
Timing-safe validation

Rate Limiter

Rate limiting with @fastify/rate-limit

npx hanma add fastify-rate-limiter --framework fastify

Configurable limits
Route-specific rate limits
Presets for common use cases

Swagger/OpenAPI

OpenAPI documentation with Swagger UI

npx hanma add fastify-swagger --framework fastify

OpenAPI 3.1.0 specification
Interactive Swagger UI at /docs
JSON specification at /docs.json

Frequently Asked Questions

How do I implement Authentication in Fastify?

Browse the snippets above and copy the code that matches your needs. Each snippet includes installation instructions and usage examples.

Are these snippets production-ready?

Yes, all snippets are designed for production use. However, always review and test them in your specific context before deployment.

Can I use these snippets with other Fastify versions?

These snippets are designed for the current major version of the framework. Check the snippet documentation for version compatibility notes.