JSON values parsed as undefined in javascript

I am trying to parse a JSON in Javascript. The JSON is created as an ajax response:

$.ajax(url, {
        dataType: "text",
        success: function(rawData, status, xhr) {
            var data;
            try {
                    data = $.parseJSON(rawData);
                    var counter = data.counter;
                    for(var i=1; i<=counter; i++){
                    //since the number of 'testPath' elements in the JSON depend on the 'counter' variable, I am parsing it in this way
                    //counter has the correct integer value and loops runs fine
                        var currCounter = 'testPath'+i ;
                        alert(data.currCounter); // everything alerts as undefined
                    }
                }
             } catch(err) {
                 alert(err);
            }
        },
        error: function(xhr, status, err) {
            alert(err);
        }
        });

But all values alert 'undefined' as value (except the 'counter' which gives correct value) The actual string as seen in firebug is as below:

{"testPath1":"ab/csd/sasa", "testPath2":"asa/fdfd/ghfgfg", "testPath3":"ssdsd/sdsd/sds", "counter":3}