index.js

import WebTorrent from 'webtorrent'

let client = new WebTorrent()

let uri = 'http://releases.ubuntu.com/15.04/ubuntu-15.04-desktop-amd64.iso.torrent'
client.add(uri, torrent => {
  console.log('Client is downloading:', torrent.infoHash)
  for (let file of torrent.files) {
    console.log(file)
  }
})