如何从顶部开始解析json字符串？

Question

I have a json API that has many optional fields. When I receive this object I need to parse it and add the data to a database. JSON.parser() seems to parse the inner most data first which is a waste. I need to start parsing from the top most level first.

Will I need to make a custom string parser or is one available?

Example API:

"AddRequest" : {
    "OptionalId" : "",
    "OptionalType" : {
        "Status" : "taken",
        "DateStart" : "21/05/2013",
        "DateEnd" : "21/06/2013",
        "Summary" : "It was really good"
    },
    "OptionalHotels" : [
        {
            "HotelId" : "1",
            "CheckIn" : "21/05/2013", 
            "CheckOut" : "21/06/2013", 
            "Name" : "Hotel Name", 
            "Latitude" : "", 
            "Longitude" : "",
            "City" : "Toronto"
        },
        ... 
    ],
    ...
}

---

The code:

var jsonObject = JSON.parse(data , 
    function(k, v) {
        console.log(k + ':' + v);
    }
);

Answer 1

The second argument to JSON.parse is a function to transform the data.

If you just want to access it, then parse it normally and then access the properties you care about from the return value.

var javaScriptObject = JSON.parse(data);
console.log(javaScriptObject.whateverYouWantFirst);