Simple youtube mp3

simple-youtube-dl.js

require('express-async-errors')
const http = require('http')
const bodyParser = require('body-parser')
const errorhandler = require('errorhandler')
const app = require('express')()

app.use(bodyParser.urlencoded({ extended: false })).use(bodyParser.json())

app.set('trust proxy', true)

app.get('/watch', (req, res) => {
  const ytid = req.query.v
  const link = `https://www.youtube.com/watch?v=${ytid}`

  const update = require('child_process').spawn('youtube-dl', [
    '-g',
    '-f',
    'bestaudio',
    '--extract-audio',
    '--audio-format',
    'mp3',
    '--audio-quality',
    '0',
    link
  ])

  const errorArr = []
  const rs = []
  update.stderr.on('data', (data) => errorArr.push(data))
  update.stdout.on('data', (data) => rs.push(data))
  update.on('exit', (code) => {
    const stderr = errorArr.join('')
    if (code) {
      console.error(stderr)
    }

    res.header('content-type', 'text/plain')
    if (code) {
      res.status(500).send(stderr)
    } else {
      res.redirect(rs.join(''))
    }
  })
})

app.use(errorhandler())

const port = process.env.PORT || 3000

const server = http.createServer(app).listen(port, () => {
  console.log(`Listening on port http://localhost:${server.address().port}`)
})