https://docs.microsoft.com/en-us/dotnet/api/system.net.http.json.jsoncontent?view=net-10.0
JsonContent Class (System.Net.Http.Json) | Microsoft Learn
Provides HTTP content based on JSON.
class systemhttpjsonmicrosoftlearn
https://velocity.apache.org/tools/3.0/apidocs/org/apache/velocity/tools/generic/JsonContent.html
JsonContent (VelocityTools 3.0 API)
api