json-in-querystring.js

'use strict'

const qs = require('qs')
const Ajv = require('ajv')

const ajv = new Ajv({
  removeAdditional: true,
  useDefaults: true,
  coerceTypes: true
})

const fastify = require('fastify')({
  querystringParser: (str) => {
    const result = qs.parse(str)

    if (result.filter && typeof result.filter === 'string') {
      result.filter = JSON.parse(result.filter)
    }

    return result
  }
})

ajv.addKeyword({
  keyword: 'x-consume',
  code: (ctx) => Promise.resolve(true)
})

fastify.setValidatorCompiler(({ schema }) => ajv.compile(schema))

fastify.register(require('../index'), {
  openapi: {
    info: {
      title: 'Test swagger',
      description: 'testing the fastify swagger api',
      version: '0.1.0'
    }
  },
  exposeRoute: true
})

fastify.register(async function (fastify) {
  fastify.route({
    method: 'GET',
    url: '/',
    schema: {
      querystring: {
        type: 'object',
        required: ['filter'],
        additionalProperties: false,
        properties: {
          filter: {
            type: 'object',
            required: ['foo'],
            properties: {
              foo: { type: 'string' },
              bar: { type: 'string' }
            },
            'x-consume': 'application/json'
          }
        }
      }
    },
    handler (request, reply) {
      reply.send(request.query.filter)
    }
  })
})

fastify.listen({ port: 3000 }, (err, addr) => {
  if (err) throw err
})