JSON.stringify not generating correct json

I am having problems with JSON.stringify because I cannot create the json format of the model I want to convert. The screen below was the result of JSON.stringify and as you can see in the highlighted part there are some jaggies in the json itself.

Below is my code to populate the model:

LookupBase[] lCityLookups = bgReportsUtil.GetLookupCities(_PersonUID, _ClientUID);
JsonResult json = new JsonResult();
json.Data = lCityLookups; //support;
json.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
json.MaxJsonLength = int.MaxValue;
return json;

      

        
        
        
      

    

Below is my javascript code:

$.ajax({
    url: "SaladEntry/FillData",
    type: "POST",
    cache: false,
    contentType: "application/json;",
    data: paramSerialized,
    success: function (resultVal) {
    alert(JSON.stringify(resultVal));
});

      

        
        
        
      

    

The problem is above, but it doesn't completely solve my real problem. I want to create a chart using google chart and then create an image file and save it to the server, but I am stuck with this error.

If you go to the place where the error occurred.

This is the code for how I am creating the chart.

        var arrMain = [];
    for (var i = 0; i < resultVal.length; i++) {
    var arr = [resultVal[i].ScaleMin, resultVal[i].PK, resultVal[i].CountryNo, resultVal[i].stringEffectiveDate, resultVal[i].ScaleMax, String(resultVal[i].Currency)];
    arrMain.push(arr);
    }
    console.log(arrMain);   //to remove
    var data = new google.visualization.DataTable();
    data.addColumn('number', 'ScaleMin');
    data.addColumn('string', 'PK');
    data.addColumn('number', 'CountryNo');
    data.addColumn('string', 'stringEffectiveDate');
    data.addColumn('number', 'ScaleMax');
    data.addColumn('string', 'Currency');
    data.addRows(arrMain);

    var options = {
'title': 'Title',
'width': 800,
'height': 600
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
google.visualization.events.addListener(chart, 'ready', function () {
chart_div.innerHTML = '<img src="' + chart.getImageURI() + '">';
});
chart.draw(data, options);
$.ajax({
url: "SaladEntry/SaveToLocal",
type: "POST",
data: { 'jsonData': chart.getImageURI() },
success: function (ret) {
alert(ret);
}
});