The Duende.BFF (Backend for Frontend) security framework packages the necessary components to secure browser-based frontends (e.g. SPAs or Blazor applications) with ASP.NET Core backends.
Duende.BFF is free for development, testing and personal projects, but production use requires a license. Special offers may apply.
The source code for the BFF framework can be found on github. Builds are distributed through NuGet. Also check out the samples.