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Editorial Team
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Asked: 2026-05-12T05:57:54+00:00

I am using the autocomplete feature of jQuery. When I try to retrieve the

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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?

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1 Answer

  1. Editorial Team

    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>
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