how to use serializeArray on button click in jquery

<script type="text/javascript">
        function ADD2Grid() {
            //Getting the source data with ajax GET request
            var tt = $('#ddltitle :selected').text() + "|" +
                $("#<%=txtfn.ClientID %>").val() + "|" +
                $("#<%=txtmn.ClientID %>").val() + "|" +
                $("#<%=txtln.ClientID %>").val();
            //alert(tt);
            var data = [{ "empName": $("#<%=txtfn.ClientID %>").val(),
                "age": $("#<%=txtmn.ClientID %>").val(),
                "department": { "id": "1234", "name": "Sales" },
                "author": $("#<%=txtln.ClientID %>").val()
            }];

            // prepare the data
            var source =
{
    datatype: "json",
    datafields: [
        { name: 'empName' },
        { name: 'age' },
        { name: 'id', map: 'department>id' },
        { name: 'name', map: 'department>name' },
        { name: 'author' }
    ],
    localdata: data
};
            var dataAdapter = new $.jqx.dataAdapter(source,
                {  contentType: 'application/json; charset=utf-8'}
            );
            $("#jqxgrid").jqxGrid({
                source: dataAdapter,
                theme: 'classic',
                columns: [
                    { text: 'empName', dataField: 'empName', width: 50 },
                    { text: 'age', dataField: 'age', width: 250 },
                    { text: 'name', dataField: 'name', width: 250 },
                    { text: 'author', dataField: 'author', width: 250 }
                ]
            });
        };
    </script>

var sp = tt.split("|");
            if (getData == null) {
                getData = "{'empName' :'" + sp[0] + "','age':'" + sp[1] + "','department':'" + "Sales" + "','author':'" + sp[2] + "'},";
            }
            else {
                getData += "{'empName' :'" + sp[0] + "','age':'" + sp[1] + "','department':'" + "Sales" + "','author':'" + sp[2] + "'},";
            }
            
            var fullData = "[" + getData.replace(/'/g, '"') + "]";
            alert(fullData); // Excutes
            var data = JSON.parse(fullData);
            alert(data); // not Excuting

Uncaught SyntaxError: Unexpected token ]