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Plugins Folder

Plugins define behavior that is common to all the routes in your application. Authentication, caching, templates, and all the other cross cutting concerns should be handled by plugins placed in this folder.

Files in this folder are typically defined through the fastify-plugin module, making them non-encapsulated. They can define decorators and set hooks that will then be used in the rest of your application.

Check out:

Auth Plugin

The auth.ts plugin provides JWT-based session validation:

  • Session Middleware: Attaches session to request.session on every request via Bearer token validation
  • Request Extension: Extends FastifyRequest with session property

Usage

// In a route handler
fastify.get('/protected', async (request, reply) => {
  // Session is automatically attached by the auth plugin
  if (!request.session) {
    return reply.code(401).send({ error: 'Unauthorized' })
  }
  
  const userId = request.session.user.id
  // ... use userId
})

The plugin validates Bearer tokens, verifies JWTs, and loads session data from the database. Routes should check request.session directly to determine authentication status.