ASP.NET Core 3.0: Where Did `AddJsonOptions` Go?

Changes in the AddJsonOptions method in ASP.NET Core 3.0

Problem: After upgrading to ASP.NET Core 3.0, the AddJsonOptions method disappeared and reinstalling the dependencies did not solve the problem.

Answer:

Background:

ASP.NET Core 3.0 changes the default JSON serialization mechanism. Json.NET has been replaced by a new, performance-focused JSON API.

Use Json.NET:

If you require Json.NET compatibility, please follow these steps:

1. Install the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package.
2. In the Startup method of the ConfigureServices class, configure MVC with the following code:

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

Configuration options:

You can further configure Json.NET options using overloaded methods:

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

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