Convert string to JSON Object

How do I convert string to object? I am facing this problem because I am trying to read the elements in the JSON string using "each".

My string is given below.

jsonObj = "{"TeamList" : [{"teamid" : "1","teamname" : "Barcelona"}]}"

I have used eval and I have used

var obj = $.parseJSON(jsonObj);

And i have also used

var obj= eval("(" + jsonObj + ")");

But it comes null all the time