Getting “The JSON request was too large to be deserialized”

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You have to adjust the maxJsonLength property to a higher value in web.config to resolve the issue.

<system.web.extensions>
    <scripting>
        <webServices>
            <jsonSerialization maxJsonLength="2147483644"/>
        </webServices>
    </scripting>
</system.web.extensions>

Set a higher value for aspnet:MaxJsonDeserializerMembers in the appSettings:

<appSettings>
  <add key="aspnet:MaxJsonDeserializerMembers" value="150000" />
</appSettings>

If those options are not working you could try creating a custom json value provider factory using JSON.NET as specified in this thread.

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