Node.js - API mock server

index.js

'use strict'

const Koa = require('koa')
const cors = require('@koa/cors')
const Router = require('koa-router')
const bodyparser = require('koa-bodyparser')
require('colors')

const app = new Koa()
const router = new Router()

const wait = (time) => {
  return new Promise((resolve) => {
    setTimeout(() => resolve(), time)
  })
}

const error = (status, ctx) => {
  switch (status) {
    case 400: {
      ctx.status = 400
      ctx.body = {
        errors: [
          {
            code: '400',
            message: 'Faild Error'
          }
        ],
        message: '400 Faild Error'
      }
      break
    }
    case 404: {
      ctx.status = 404
      ctx.body = {
        errors: [
          {
            code: '404',
            message: 'Not Found Error'
          }
        ],
        message: '404 Not Found Error'
      }
      break
    }
    case 500: {
      ctx.status = 500
      ctx.body = {
        errors: [
          {
            code: '500',
            message: 'Server Error'
          }
        ],
        message: '500 Server Error'
      }
      break
    }
  }
}

router.get('/sample', async (ctx, next) => {
  const { method, url, body } = ctx.request
  console.log(`[${method}: ${url}]`.yellow)
  const _options = { method, url }
  if (body) {
    console.log('[REQ]'.yellow)
    console.log(body)
    _options.data = body
  }
  await wait(500)
  ctx.set('Content-Type', 'application/json')
  // 200
  ctx.status = 200
  ctx.body = {
    id: 0,
    value: 'sample'
  }
  // error(400, ctx)
  if(ctx.status === 200) {
    console.log('[RES]'.yellow)
  } else {
    console.log('[ERR]'.yellow)
  }
  console.log(ctx.body)
  await next()
})

app
  .use(cors())
  .use(bodyparser())
  .use(router.routes())
  .use(router.allowedMethods())

const server = app.listen('8080', '127.0.0.1', () => {
  const host = server.address().address
  const port = server.address().port
  console.log('listening at http://%s:%s', host, port)
})