Parse json in jquery?

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jQuery

here is my code:

var jsonData = JSON.stringify(data);
                    alert(jsonData);

its return a string:
[{"studentId":1,"name":"XYZ"}]
but when iam passing jsonData to objData:

var objData = $.parseJSON(jsonData);
                    alert(objData);

iam getting :[object Object]
but i want a string:

var id = objData.studentId;
               var fname = objData.name; 

Can anyone please let me know what I am missing here