如何访问JSON解析数组的第3维

Question

我正在尝试集成快递服务公司的api。在此api返回json解析数组，这是多维数组。我要检查的是，如果值是“ yes”或只是“ Y”，则数组中是否包含少量参数或元素

var d = JSON.parse(response);
          $("#response").html(d);
          $.each(d, function(index, el) {
            console.log("Output");;
          });

{
  "delivery_codes": [
    {
      "postal_code": {
        "district": "Ujjain",
        "pin": 456010,
        "max_amount": 0,
        "pre_paid": "Y",
        "cash": "Y",
        "pickup": "Y",
        "repl": "Y",
        "cod": "Y",
        "sort_code": "UJJ/SAK",
        "is_oda": "N",
        "state_code": "MP",
        "max_weight": 0
      }
    }
  ]
}

我得到的控制台错误是

TypeError：无法使用“ in”运算符在“ {{delivery_codes ...””中搜索“ length”