Javascript: Json to Download CSV

function Json2CSV(objArray)
    {
      var 
        getKeys = function(obj){
          var keys = [];
          for(var key in obj){
            keys.push(key);
          }
          return keys.join();
        }, objArray = format_json(objArray)
        , array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray
        , str = ''
      ;

      for (var i = 0; i < array.length; i++) {
        var line = '';
        for (var index in array[i]) {
          if(line != '') line += ','
       
          line += array[i][index];
        }

        str += line + '\r\n';
      }

      str = getKeys(objArray[0]) + '\r\n' + str;

      var a = document.createElement('a');
      var blob = new Blob([str], {'type':'application\/octet-stream'});
      a.href = window.URL.createObjectURL(blob);
      a.download = 'export.csv';
      a.click();
      return true;
    }