text: const express = require('express')
  const parser = require('body-parser')
  const router = require('./router')
  
  const app = express()
  const port = process.env.PORT || 3000
  
  app.use(parser.json())
  app.use('/products', router)
  app.get('/', (req, res) => res.send('Hello World!'))
  
  app.listen(port, () => console.log(`Example app listening on port ${port}!`))
  