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    <p>If you are using MVC <strong>4</strong>, be sure to check out <em><a href="https://stackoverflow.com/a/12278956/160173">this answer</a></em> as well.</p> <hr> <p>If you are still receiving the error:</p> <ul> <li>after setting the <code>maxJsonLength</code> property to its maximum value in web.config</li> <li>and you know that your data's length is less than this value</li> <li>and you are not utilizing a web service method for the JavaScript serialization</li> </ul> <p>your problem is is likely that:</p> <blockquote> <p>The value of the MaxJsonLength property applies only to the internal JavaScriptSerializer instance that is used by the asynchronous communication layer to invoke Web services methods. <em>(<a href="http://msdn.microsoft.com/en-us/library/system.web.configuration.scriptingjsonserializationsection.maxjsonlength.aspx" rel="noreferrer">MSDN: ScriptingJsonSerializationSection.MaxJsonLength Property</a>)</em></p> </blockquote> <p>Basically, the "internal" <code>JavaScriptSerializer</code> respects the value of <code>maxJsonLength</code> when called from a web method; direct use of a <code>JavaScriptSerializer</code> (or use via an MVC action-method/Controller) does <strong>not</strong> respect the <code>maxJsonLength</code> property, at least not from the <code>systemWebExtensions.scripting.webServices.jsonSerialization</code> section of web.config.</p> <p>As a workaround, you can do the following within your Controller (or anywhere really):</p> <pre><code>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 = "foo", Text = "var" }; var result = new ContentResult{ Content = serializer.Serialize(resultData), ContentType = "application/json" }; return result; </code></pre> <hr> <p><em>This answer is my interpretation of <a href="http://forums.asp.net/p/1356198/2782837.aspx#4024065" rel="noreferrer">this asp.net forum answer</a>.</em></p>
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    1. POCan I set an unlimited length for maxJsonLength in web.config?
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    1. USDavid Murdoch
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    1. COYour answer was really helpful as I am using the `Json()` action result method in asp.net mvc.
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      1. USjessegavin
    2. COYep I was a Json() suffer too. Thanks!
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    3. COAlthough it is completely correct and deserving of its place, this is one of those questions where it's worth reading past the top answer :). Thanks!
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      1. USNigel
 

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