youtube playlist downloader

index.js

var path = require('path')
var fs = require('fs')
var ytdl = require('youtube-dl')
 
function playlist (url) {
  var video = ytdl(url) // add , ['--audio-format=mp3'] for mp3 only
 
  video.on('error', function error (err) {
    console.log('error 2:', err)
  })
 
  var size = 0
  var dir
  video.on('info', function (info) {
    if (!dir) {
      dir = __dirname + '/' + info.playlist_title
      try { fs.mkdirSync(dir) } catch (e) {}
    }
    size = info.size
    var num = ("00" + info.playlist_index).substr(-3, 3) // left pad
    var output = path.join(dir, num + ' - ' + info.fulltitle + '.mp4')
    video.pipe(fs.createWriteStream(output))
  })
 
  var pos = 0
  video.on('data', function data (chunk) {
    pos += chunk.length
    // `size` should not be 0 here.
    if (size) {
      var percent = (pos / size * 100).toFixed(2)
      process.stdout.cursorTo(0)
      process.stdout.clearLine(1)
      process.stdout.write(percent + '%')
    }
  })
 
  video.on('next', playlist)
}
 
playlist(process.argv[2])