How to parse JSON data

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ASP.NET

jQuery

JSON

Hi,

I am struggling to parse JSON data. I am calling a webmethod to get JSON data in form of string.
here is the sample.

{
    "data": [
        {
            "act": "8.6",
            "dt": "01-Feb-2004"
        },
        {
            "act": "4.9",
            "dt": "01-Mar-2004"
        },
        {
            "act": "7.3",
            "dt": "01-Apr-2004"
        },
        {
            "act": "6.8",
            "dt": "01-May-2004"
        },
        {
            "act": "8.1",
            "dt": "01-Jun-2004"
        }
    ]
}

This is how I am trying to parse it.

$.ajax({
         type: "POST",
         url: "testJSON.aspx/getHistory",
         data: "{}",
         contentType: "application/json",
         dataType: 'json',
         success: function (data) {
         alert('Into the function');
         var obj = JSON.parse(data);
         }
      });

I found

SyntaxError: JSON.parse: unexpected character

error while debugging in firebug. I have checked my JSON on http://jsonlint.com/[^] and its seems to be fine.

Anyone can point out mistake. I must doing something silly out here. Please give me the solution.