fastify-accepts-serializer

fastify-accepts-serializer

Serializer according to the Accept header

Install

npm i --save fastify-accepts-serializer

Usage

const protobuf = require('protobufjs')
const YAML = require('yamljs')
const msgpack = require('msgpack5')()

const root = protobuf.loadSync('test/awesome.proto')
const AwesomeMessage = root.lookupType('awesomepackage.AwesomeMessage')

let fastify = require('fastify')()

// Global serializers
fastify.register(require('fastify-accepts-serializer'), {
  serializers: [
    {
      regex: /^application\/yaml$/,
      serializer: body => YAML.stringify(body)
    },
    {
      regex: /^application\/x-msgpack$/,
      serializer: body => msgpack.encode(body)
    }
  ],
  default: 'application/yaml' // mime type used if Accept header don't match anything
})

// Per-router serializers
const config = {
  serializer: {
    serializers: [
      {
        regex: /^application\/x-protobuf$/,
        serializer: body => AwesomeMessage.encode(AwesomeMessage.create(body)).finish()
      }
    ]
  }
}

fastify.get('/request', { config }, function (req, reply) {
  reply.send({pippo: 'pluto'})
})

Behaviour

For each route, it's defined a SerilizerManager that has a merge of per-route and global serializers definition.

The mime type application/json is always handled by fastify if no serializer is register for that mime type.

If no default key is specified in configuration, all requests with unknown Accept header will be replied with an 406 response (a boom error is used)