16/06/13 09:57:57.31 CfEi32hJ.net
>>612が指摘している問題はおそらく、こういうこと
var obj = {fn: function fn () {}, date: new Date, undefined: undefined};
console.log(obj);
console.log(JSON.stringify(obj)); // "{"date":"2016-06-13T00:45:07.522Z"}"
console.log(JSON.parse(JSON.stringify(obj))); // {"date":"2016-06-13T00:45:07.522Z"}
var array = [function fn () {}, new Date, undefined];
console.log(array);
console.log(JSON.stringify(array)); // "[null,"2016-06-13T00:48:58.483Z",null]"
console.log(JSON.parse(JSON.stringify(array))); // [null, "2016-06-13T00:52:23.947Z", null]