如何解析其元素将发生变化的json对象？

Question

我将如何解析此JSON？例如，pnrstatus的元素将会改变。

JSON

{
"chartStatus": "CHART NOT PREPARED",
"to": "PUNE",
"boardingPoint": "MS",
"boardingDate": "6- 7-2016",
"pnrStatus": {
    "2": "Passenger 2:W/L 40,PQWL:W/L 25",
    "1": "Passenger 1:W/L 39,PQWL:W/L 24"
},
"reservedUpto": "PUNE",
"fare": "1030",
"class": "SL",
"from": "MS",
"trainNo": "12164",
"trainName": "CHENNAI EXP"
}