code for getting song list json from vk.com

get_vk_songs_json.js

var hiddenFields = document.getElementsByTagName("input");
var mp3s = [];
function getHiddenField(elem, index, collection){
    if(elem.getAttribute("type") == "hidden" && (/audio_info\d+_\d+/).test(elem.getAttribute("id"))){
        mp3s.push({
          'artist': elem.parentElement.nextSibling.nextSibling.childNodes[1].childNodes[0].textContent,
          'title': elem.parentElement.nextSibling.nextSibling.childNodes[1].childNodes[2].textContent,
          'url': elem.getAttribute("value").split(",")[0].split('?')[0]
        });
    }
}
for(var i=0; i < hiddenFields.length; i++){
    getHiddenField(hiddenFields[i], i, hiddenFields);
}
console.log(JSON.stringify(mp3s));