fastify-constraints

Fastify plugin to add constraints to multiple routes

Install

npm i fastify-constraints

Usage

Register fastify-constraints as a Fastify plugin. The plugin will create an onRoute hook that will add the constraints to the routes. Contstraints should be specified in the constraints property of the plugin options. To see available constraints refer to the Fastify documentation.

import Fastify from 'fastify'
import fastifyConstraints from 'fastify-constraints'

const fastify = Fastify()

// Register the plugin
await fastify.register(fastifyConstraints)

// Register plugins containing routes with the constraints
await fastify.register(await (instance, opts) => 
  instance.get('/', () => 'Hello from version 1.0.0'), // Add a route
  { constraints: { version: '1.0.0' } }
)


// Start the server
await fastify.listen({ port: 3000 })

You can also specify constraints for specific routes which will be merged:

await fastify.register(fastifyConstraints)
await fastify.register(async (instance, opts) => {
  fastify.get('/', () => 'Hello from version 1.0.0') // This route will have the version constraint
  fastify.get('/host-restricted', { constraints: { host: 'example.com' } }, () => 'Hello from example.com') // This route will have the version and host constraint
}, {
  constraints: { version: '1.0.0' }
})

Note: In case of collision the constraints specified in the route will take precedence over the constraints specified in the plugin options.

Examples

See the examples folder for a complete examples.