CODEWITHSUNDEEP
javascript
user425727
user425727

Reputation:

parse JSON function

Can someone explain to me how this parse function actually works?

function parseFlickrJson(jsonstring){
    var data=null;

    var jsonFlickrApi=function(d){
        data = d;
    }

    eval(jsonstring);

    return data;
}

Upvotes: 3

Views: 591

Answers (1)

bradley.ayers
bradley.ayers

Reputation: 38382

JSON is actually valid JavaScript. So all you need to 'decode' it, is to evaluate it as JavaScript (hence the eval). It's also using something known as JSONP http://en.wikipedia.org/wiki/JSONP where more than just JSON is returned.

JSONP is basically JSON wrapped in a function call. The content of a JSONP response might be:

parseResponse({"Name": "Cheeso", Id : 1823, "Rank": 7})

What this means is that when you evaluate JSONP, it will attempt to call a function (in this example parseResponse and in your case jsonFlickrApi). This is why the jsonFlickrApi function must be defined before the eval(jsonstring) occurs.

Upvotes: 7

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