How to pass a JSON array in javascript to my codebehind file

I am getting a JSON object in my javascript function in aspx page. I need to fetch this data from my code behind file. How can I do it?

My javascript function is :

 function codeAddress() 
    {
        var address = document.getElementById("address").value;
        var geocoder = new google.maps.Geocoder();            
        geocoder.geocode({ 'address': address }, function(results, status) {
            if (status == google.maps.GeocoderStatus.OK) {
                map.setCenter(results[0].geometry.location);
                var marker = new google.maps.Marker({ map: map, position: results[0].geometry.location });
            }
            else {
                alert("Geocode was not successful for the following reason: " + status);
            }

            var requestParameter = '{' +
                        'output:"' + results + '"}';

            $.ajax({
                type: "POST",
                url: "Default.aspx/GetData",
                data: requestParameter,
                //contentType: "plain/text",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function(msg) {
                    alert(msg.d);

                }, 
                error: function() { alert("error"); } 
            });

        });
    }


   Default.aspx.cs

 [WebMethod]
public static string  GetData( Object   output) 
{
    return output.ToString();
}

I am getting the output as an array of objects instead of the actual result - [object Object],[object Object],[object Object] .Please provide me a solution to get the actual result. The JSON I am working on is given below http://maps.googleapis.com/maps/api/geocode/json?address=M%20G%20Road&sensor=false