yt.js

const fs = require('fs');
const ytdl = require('ytdl-core');
const colors = require('colors');
const stringSimilarity = require("string-similarity");
const readline = require("readline");
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

let dwnloadDir = './downloaded/';

let fetchFolder = './otherdownloads/';
let mode;

if (!fs.existsSync(dwnloadDir)){
    fs.mkdirSync(dwnloadDir);
}

let f = 0;
let videosArray = [];
let files = [];

fs.readdirSync(fetchFolder).forEach(file => {
  files.push(file.replace('.mp3', ''));
  console.log(("(===) " + file.replace('.mp3', '')).green);
});

async function download(videos) {
  for (i=0; videos.length > i; i++) {
    let url = videos[i];
    let probsError = false;
    let info = await ytdl.getInfo(url).catch((err) => {
      console.log("Fatal fetching error occured. Skipped: " + url);
      console.log(err);
      f++
      probsError = true;
    });
    if (probsError) {
      continue
    }
    let name = info.videoDetails.title;
    name = name.replace(/\\|\/|\:|\*|\?|\"|\<|\>|\|/g, '');
    let percent = 0;
    if (files.length > 0) {
      let matched = stringSimilarity.findBestMatch(name, files);
      percent = matched.bestMatch.rating*100;
      let prcntStr = "(" + percent + "%) " + name + "\n\u200b[" + files[matched.bestMatchIndex] + "]";
      if (percent >= 80) {
        console.log((prcntStr).blue);
      }
      else if (percent >= 50) {
        console.log((prcntStr).yellow);
      }
      else {
        console.log((prcntStr).magenta);
      }
    }
    if (files.length === 0 || percent < 50) {
      let wrtStrm = await fs.createWriteStream(dwnloadDir + name + ".mp3");
      console.log("Downloading url " + url + " under filename " + name + ".mp3");
      await ytdl.downloadFromInfo(info, { filter: 'audioonly', quality: 'highestaudio' })
        .on('error', (err) => {
          console.log(("Couldn't get stream from " + url + " (" + name + ") with preferred quality.").red);
          console.log(err);
          f++
        })
        .pipe(wrtStrm);
      wrtStrm.on('error', (err) => {
        console.log(("(ERR) " + name).red);
        console.log(err);
        f++
      });
      wrtStrm.on('finish', () => {
        console.log(("(+) " + name).green);
        f++
      })
    }
    else {
      f++
    }
  }
}

console.log("Please input your URLs. Hit enter twice when you're done.");

rl.on('line', (input) => {
  if (input === '') {
    rl.emit('close');
    return
  }
  videosArray.push(input);
})

rl.on('close', async () => 
  setInterval(() => {
    if (f === videosArray.length) {
      console.log("All pending files have been successfully downloaded.");
      process.exit()
    }
  }, 1000);
});