Cassettea-api-node/routes/index.js

var express = require('express');
var YoutubeMp3Downloader = require("youtube-mp3-downloader");

var router = express.Router();
var YD = new YoutubeMp3Downloader({
  "ffmpegPath": __dirname + "/../bin/ffmpeg",
  "outputPath": __dirname + "/../music",
  "youtubeVideoQuality": "highest",
  "queueParallelism": 1,
  "progressTimeout": 2000
});

/* GET home page. */
router.get('/', (req, res, next) => {
  res.render('index', { title: 'Express' });
});

router.get('/download', (req, res, next) => {
  YD.download(req.query.url);

  YD.on('finished', (err, data) => {
    if (err) {
      res.json({ result: err });
    } else {
      res.json({ result: data });
    }
  });
})

module.exports = router;