JsonConverter Attribute in ASP.NET Core 3.0 Web API

In .NET Core 3.0, a built-in JSON converter is available in namespace System.Text.Json, and ASP.NET Core 3.0 uses this new JSON converter by default. Therefore, when you migrate your Web API from ASP.NET Core 2.x to 3.0, you need to replace JsonConverter attribute with System.Text.Json.

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