Node.js - proxy server

gistfile1.txt

const internalIp = require('internal-ip')
const express = require('express')
const proxy = require('express-http-proxy')
const app = express()
require('colors')

const isLocalIpHosting = process.argv[2] === 'local-ip-hosting'

;(async() => {

  const host = '0.0.0.0'
  const port = 8080
  const proxyUrl = 'http://develop.example.com/api/v1/'

  const clientIp = isLocalIpHosting ? await internalIp.v4() : 'localhost'
  const clientPort = 3000
  const clientUrl = `http://${clientIp}:${clientPort}`

  app.use(
    proxy(proxyUrl, {
      proxyReqBodyDecorator(bodyContent, srcReq) {
        console.log(`${'[REQ]'.yellow} ${new Date().toString().gray}`)
        const { method, url, query } = srcReq
        console.log(`${method.magenta} ${url}`)
        if (Object.keys(query).length) {
          console.log(query)
        }
        if (bodyContent) {
          try {
            console.log(JSON.parse(bodyContent.toString('utf8')))
          } catch (err) {
            return bodyContent
          }
        }
        console.log('')
        return bodyContent
      },
      userResHeaderDecorator(headers, userReq, userRes, proxyReq, proxyRes) {
        headers['Access-Control-Allow-Origin'] = clientUrl
        headers['Access-Control-Allow-Credentials'] = true
        return headers;
      },
      userResDecorator(proxyRes, proxyResData, userReq, userRes) {
        const { statusCode, statusMessage } = proxyRes
        let data = null
        try {
          data = JSON.parse(proxyResData.toString('utf8'))
        } catch (err) {
          return proxyResData
        }
        console.log(`${'[RES]'.yellow} ${new Date().toString().gray}`)
        console.log(`${statusCode.toString().magenta} ${statusMessage.toString().blue}`);
        console.log(data)
        console.log('')
        return proxyResData
      }
    })
  )

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

})()