MaxJsonLength error during serialization or deserialization using the JSON JavaScriptSerializer in ASP.NET MVC

For ASP.NET MVC, you need to MaxJsonLength to int.Maxvalue in your controller, so return JSON like this

public JsonResult ShowDataTable(bool? clear,string types, string status)
        {

           //Some code here


   var jsonResult = Json(new { sEcho = sEcho, iTotalRecords = TotlCount, iTotalDisplayRecords = TotlCount, aaData = List3 }, JsonRequestBehavior.AllowGet);
                   jsonResult.MaxJsonLength = int.MaxValue;
                   return jsonResult;
                
            
        }

For those who are getting error while working on ASP.NET Web API, go to your web.config and set the MaxJsonLength property

<configuration> 
   <system.web.extensions>
       <scripting>
           <webServices>
               <jsonSerialization maxJsonLength="50000000"/>
           </webServices>
       </scripting>
   </system.web.extensions>
</configuration> 

The above solutions should reaolve your issue.

The default value for maxJsonLength is 102400.

If you are still getting error, even after settings maxjsonlength in web.config, then you can directly use C# Code in Controller as below

var serializer = new JavaScriptSerializer();

// For simplicity just use Int32's max value.
// You could always read the value from the config section mentioned above.
serializer.MaxJsonLength = Int32.MaxValue;

var resultData = new { Value = "Testing", Text = "Hello World" };
var result = new ContentResult{
    Content = serializer.Serialize(resultData),
    ContentType = "application/json"
};
return result;

That's it.