Mining Data from JSON documents

I am dealing with a webservice that returns JSON data in the following format:

{"d":"{\"RES\":[],\"STAT\":\"FAIL\",\"SID\":\"0\"}"}

So, my question is how can I extract the STAT=FAIL value from this JSON response? The service is written in C#.

This is the script I have implemented:

$.ajax({
    type: "POST",
    url: "http://localhost/EMRDMSService/Service.asmx/User_Login",
    data: "{lg:" + JSON.stringify(GetLogDet) + "}",
    // url: "http://localhost/EMRDMSService/Service.asmx/Permission_List",
    // data: "{userid:" + JSON.stringify(GetLogDet) + "}",

    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (r) {          
        console.log(r.d.STAT);
    }
});

However, when I try to access r.d.STAT, it returns undefined. Can anyone provide assistance on resolving this issue?

javascriptjson

Answer №1

Several commenters have pointed out that the JSON object 

{"d":"{\"RES\":[],\"STAT\":\"FAIL\",\"SID\":\"0\"}"}
is not formatted correctly. If you are unable to update the webservice, one solution could be to modify your success callback like this:

var d = JSON.parse(r.d);
console.log(d.STAT);

EDIT responding to changes made by the original poster The value of r.d.STAT will be undefined because d is being interpreted as a String rather than an Object. To resolve this issue, you will need to parse it or adjust the webservice to eliminate the quotes surrounding the value of d.

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