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The source of your error, however, is that you need to place the full JSON string in quotes. The following will fix your sample:
<!doctype HTML>
<html>
<head>
</head>
<body>
<script type="text/javascript">
var cur_ques_details="{"ques_id":"15","ques_title":"jlkjlkjlkjljl"}";
var ques_list = JSON.parse(cur_ques_details);
document.write(ques_list['ques_title']);
</script>
</body>
</html>
As the other respondents have mentioned, the object is already parsed into a JS object so you don’t need to parse it. To demonstrate how to accomplish the same thing without parsing, you can do the following:
<!doctype HTML>
<html>
<head>
</head>
<body>
<script type="text/javascript">
var cur_ques_details ={"ques_id":"15","ques_title":"jlkjlkjlkjljl"};
document.write(cur_ques_details.ques_title);
</script>
</body>
</html>
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