asp.net mvc 4 - JSON data size limit

Question

In HighChart I needs to plot a series of data against x and y axis. HighChart expects the data to be in json format. ie, [ [ x, y],[x, y]……[x, y] ]. Where x and y are time ( 1392345000 – Unix epoch format ) and value ( 49.322 ). So I am making an ajax call to get the data and on success I render the json returned data in highchart. In most of the time ie, if the count of data( [x,y] ) is below 87500 rows than Json returns the data from controller to view. But when the data exceeds 87500 the ajax error is called with 404, not found error. Is there any size restriction for json returned data.

Section-1 – Controller Class

public JsonResult GetPlotData(Dictionary<string, List<ChartData>> dataPlot)
{

    // dataPlot = D00213 - [[13245678000,49.9],[13245345000,43.9]...[n,n]]
    // if dataPlot.Count < 87500 here throwing error and in ajax error 404 Not found
    return Json(dataPlot, JsonRequestBehavior.AllowGet);

}

Section-2 – Ajax

 $.ajax(
    {
          url: '../Report/GetPlotData',
          data: { "fromDate": fromDate, "toDate":toDate, "item": items[i].id }, 
          type: "POST",
          dataType: "json",
          cache: false,
          success: function(chartData) {
              alert(‘success’
          },
          error: function(xhr, ajaxOptions, thrownError) 
          {
                    debugger;
                    ShowDialogError(xhr, 'Site Status Report');
                  }
          });

Answer 1

You webserver will limit the maximum response size limit. You should refer to documentation on your web server of choice to see how best to increase that limit beyond whatever it is set to today.

The JsonResult class does have a property (maxJsonLength) you may also try changing

var jsonResult = Json(dataPlot, JsonRequestBehavior.AllowGet);
jsonResult.MaxJsonLength = int.MaxValue;
return jsonResult;

Possible configuration change

<configuration>
    <system.web.extensions>
        <scripting>  
             <webServices>                                                   
                 <jsonSerialization maxJsonLength="1000000" />                 
             </webServices>
        </scripting>
    </system.web.extensions>
</configuration>

Most importantly - you may want to reconsider your call to limit or somehow partition the responses into more manageable chunks as a default response limit is fairly large and can take a long time to return (network latency)

Generally speaking it's usually not a good idea to increase your response size limit. But that is probably the problem you are experiencing.