How to Configure JSON Serialization in .NET Core 3.0 After the Removal of AddJsonOptions?

.NET Core 3.0 JSON Serialization Configuration Guide: Alternatives to the AddJsonOptions method

After upgrading from .NET Core 2.0 to 3.0, the default JSON processing mechanism has been switched from Json.NET. This resulted in the IMvcBuilder extension methods in AddJsonOptions being removed.

Change Description

The Microsoft.AspNetCore.Mvc.Formatters.Json method previously provided by the AddJsonOptions NuGet package allows developers to customize the JSON serialization options of ASP.NET Core Web API. In .NET Core 3.0, this feature has been replaced by the new JSON API, which focuses on improving performance.

Configuring Json.NET in .NET Core 3.0

Although the default mechanism has changed, developers can still use Json.NET with some configuration:

1. Install the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package.
2. Modify the Startup method in the ConfigureServices class to configure MVC using Json.NET:

<code class="language-csharp">services.AddControllers()
    .AddNewtonsoftJson();</code>

Custom Json.NET options

To customize Json.NET options, use the overloaded version of the AddNewtonsoftJson method:

<code class="language-csharp">services.AddControllers()
    .AddNewtonsoftJson(options =>
    {
        options.SerializerSettings.ContractResolver = new DefaultContractResolver();
    });</code>

This example sets ContractResolver to ensure lowercasing of the serialized JSON.

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