Json – set an unlimited length for maxJsonLength in web.config

asp.netasp.net-mvcjson

I am using the autocomplete feature of jQuery. When I try to retrieve the list of more then 17000 records (each won't have more than 10 char length), it's exceeding the length and throws the error:

Exception information:
Exception type: InvalidOperationException
Exception message: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.

Can I set an unlimited length for maxJsonLength in web.config? If not, what is the maximum length I can set?

Best Answer

NOTE: this answer applies only to Web services, if you are returning JSON from a Controller method, make sure you read this SO answer below as well: https://stackoverflow.com/a/7207539/1246870

The MaxJsonLength property cannot be unlimited, is an integer property that defaults to 102400 (100k).

You can set the MaxJsonLength property on your web.config:

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

Related Solutions

Asp.net-mvc – MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer

It appears this has been fixed in MVC4.

You can do this, which worked well for me:

public ActionResult SomeControllerAction()
{
  var jsonResult = Json(veryLargeCollection, JsonRequestBehavior.AllowGet);
  jsonResult.MaxJsonLength = int.MaxValue;
  return jsonResult;
}

Jquery – The length of the string exceeds the value set on the maxJsonLength property

JavaScriptSerialzer has a public property named MaxJsonLength according to

http://msdn.microsoft.com/en-us/library/system.web.configuration.scriptingjsonserializationsection.maxjsonlength.aspx

Now, where you are deserializing your json, use this

JavaScriptSerializer serializer = new JavaScriptSerializer();
serializer.MaxJsonLength = Int32.MaxValue; //Or any size you want to use, basically int maxValue is 2GB, you shouldn't need this big json string to deserialize, else you are doing it wrong.
myObject obj = serializer.Deserialize<myObject>(yourJsonString);

And this should work perfectly, I recently figured this out through msdn and solved a problem that was bugging me for long.

Best Answer

Related Solutions

Asp.net-mvc – MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer

Jquery – The length of the string exceeds the value set on the maxJsonLength property

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