Software⏱️ 2 min read📅 2026-06-02

How to Fix: MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer

Fix MaxJsonLength exception in ASP.NET MVC during Java. Try checking your system settings or res. Step-by-step guide included.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer occurs when the length of the string exceeds the value set on the maxJsonLength property.

🔍 Why This Happens

  • The issue arises when the JSON data being serialized exceeds the maximum allowed length, which is typically set in the web.config file.

✅ Best Solutions to Fix It

Method 1: Serialize only necessary data

  1. Step 1: Only include the essential fields in the JSON data.

Method 2: Use a custom serializer

  1. Step 1: Create a custom serializer that can handle large JSON data.

🎯 Final Words

To resolve the MaxJsonLength exception, consider serializing only necessary data or using a custom serializer that can handle large JSON data. Additionally, ensure that the maxJsonLength property in the web.config file is set to a reasonable value.

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