vk.com_playlist_as_json.js

(function(console){
console.save = function(data, filename){

    if(!data) {
        console.error('Console.save: No data')
        return;
    }

    if(!filename) filename = 'console.json'

    if(typeof data === "object"){
        data = JSON.stringify(data, undefined, 4)
    }

    var blob = new Blob([data], {type: 'text/json'}),
        e    = document.createEvent('MouseEvents'),
        a    = document.createElement('a')

    a.download = filename
    a.href = window.URL.createObjectURL(blob)
    a.dataset.downloadurl =  ['text/json', a.download, a.href].join(':')
    e.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
    a.dispatchEvent(e)
 }
})(console)

getAudioPlayer()
  .getPlaylist(AudioPlaylist.TYPE_PLAYLIST, vk.id, AudioPlaylist.DEFAULT_PLAYLIST_ID)
  .loadAll(function (list) {
    var json = [];
    
    list.getAudiosList().forEach(function (item) {
      json.push(AudioUtils.asObject(item))
    })

    console.save(json, vk.id + '_playlist.json')
  })