Simple example the using fastify with default response

route.js

'use strict'

const fastify = require('fastify')()

const handler = (req, reply) => {
  reply.send({ hello: 'world' })
}

const route = {
  method: 'GET',
  url: '/',
    schema: {
    querystring: {
      name: { type: 'string' },
      excitement: { type: 'integer' }
    },
    response: {
      200: {
        type: 'object',
        properties: {
          hello: { type: 'string' }
        }
      }
    }
  }
}

fastify.route(route, handler)

fastify.listen(3000)