code: function bytesToSize(bytes) {
     var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
     if (bytes == 0) return '0 Byte';
     var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
     return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
  }
docs: https://stackoverflow.com/questions/15900485/correct-way-to-convert-size-in-bytes-to-kb-mb-gb-in-javascript#18650828