Flurl.Http.Newtonsoft

Flurl.Http 4.0 removed the Newtonsoft.Json dependency in favor of System.Text.Json for its default JSON serializer implementation. This has several advantages, most notably that it dramatically reduces Flurl's footprint, which is especially important to developers using it in mobile apps and browser platforms.

But it's also a breaking change. Upgrading from 3.x may cause some pains, such as:

• Newtonsoft's serialization attributes no longer have any effect, and need be replaced by their STJ equivalents.
• Newtonsoft's configuration settings also no longer have any effect in Flurl.
• Support for dynamics has also been removed in Flurl, specifically due to the lack of support in STJ.

This package aims to solve these problems, making upgrading easier for those who still want or need Newtonsoft-based serialization. Included in this package:

• NewtonsoftJsonSearializer, an instance of which can be assigned to a Flurl client or request via Settings.JsonSerializer.
• Shortcuts for enabling the serializer more "globally":
  • When using the clientless pattern: FlurlHttp.Clients.UseNewtonsoft()
  • When using DI / named clients: new FlurlClientCache().UseNewtonsoft()
• Non-generic dynamic-returning GetJson, GetJsonList, ReceiveJson, and ReceiveJsonList extension methods.

Both NewtonsoftJsonSerializer and the UseNewtonsoft shortcuts take an optional JsonSerializerSettings parameter. In fact, the serializer was lifted directly from 3.x, so you can trust that it's battle-tested and highly performant.