How to Make JSON.Net the Default JSON Serializer in ASP.NET MVC?

Setting JSON.Net as the Default JSON Serializer in ASP.NET MVC

ASP.NET MVC 4's default JSON serializer is JavaScriptSerializer. This can lead to issues, such as enums being serialized as numbers instead of strings, when you prefer the functionality of JSON.Net.

Solution: Manual Configuration

To utilize JSON.Net as your default serializer, manual configuration is required. This typically involves creating a custom JsonNetResult class. Detailed instructions can be found in these helpful resources:

• ASP.NET MVC and Json.NET
• Using JSON.NET as the default JSON serializer in ASP.NET MVC 3

Model Binding with JSON.Net

If you also need JSON.Net for model binding (handling JSON data in controller action parameters), a custom ValueProviderFactory is necessary. Register it as follows:

<code class="language-csharp">ValueProviderFactories.Factories.Remove(ValueProviderFactories.Factories.OfType<JsonValueProviderFactory>().Single());
ValueProviderFactories.Factories.Add(new MyJsonValueProviderFactory());</code>

You can base your custom MyJsonValueProviderFactory on the built-in JsonValueProviderFactory or refer to examples like ASP.NET MVC 3 – Improved JsonValueProviderFactory using Json.Net. This ensures consistent JSON handling throughout your application.

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