Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.

When trying to return a large dataset, perhaps an array of items using JSON from both a web service or a controller, you might run into the Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property. error.

This is a simple fix for both Web Services and MVC Controllers alike, check below for the fix to both setups.

Increase maxJsonLength in Web Service

Update your web.config with the following:

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

Increase maxJsonLength in MVC Controller

Place this within your controller.

protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)
{
    return new JsonResult()
    {
        Data = data,
        ContentType = contentType,
        ContentEncoding = contentEncoding,
        JsonRequestBehavior = behavior,
        MaxJsonLength = Int32.MaxValue
    };
}

Published at

Tags: MVC,Web Service,C#,JSON

Luke Alderton

Comments

Post a comment
Sit tight...
We're adding your comment.
Thank you.
Your comment has been added.
There's been a problem.
Please try again later.
Share with
Tags
Latest Comments
By Raymondpef on MVC forms in Umbraco
20 Nov 2018, 23:58 PM
By svetikNoupt on MVC forms in Umbraco
20 Nov 2018, 19:44 PM
By Lestersep on MVC forms in Umbraco
17 Nov 2018, 13:55 PM
By nseo-sw.men on MVC forms in Umbraco
17 Nov 2018, 00:43 AM
By shale.larosh on MVC forms in Umbraco
16 Nov 2018, 22:34 PM
By EdwardPhova on MVC forms in Umbraco
16 Nov 2018, 12:40 PM
By svetikNoupt on MVC forms in Umbraco
13 Nov 2018, 22:04 PM
By nseo-sw.men on MVC forms in Umbraco
13 Nov 2018, 17:47 PM
Categories
App Development
Event
Game Development
Mapping
Modelling
Programming
Review
Robotics
Tutorial
Web Development