Json Parse using javascript

I am working in phone gap application i want to get the json value and display in web page using javascript while when i hot code my json format value.

I can able to get the all the values when i try to get dynamically. I can't get the values so. I have tried the json parse. Its working correctly because the dainamic url values all getting string format. so i can't get correctly.

var json = '{"result":true,"count":1}',
    obj = JSON.parse(json);

alert(obj.count);