ASP.NET Core Newtonsoft.Json System.Text.Json
▌Configuration
The following codes in Startup.cs: ConfigureServices(IServiceCollection services) , show the difference of JSON serialization for HTTP response with Newtonsoft.Json and System.Text.Json.
▋System.Text.Json
The namespace had been included in runtime in .NET Core 3.1 and later versions.
▋Newtonsoft.Json
If we still want to use Newtonsoft.Json as the default serialization/deserialization package, install it and write as following.