What similar libraries exist for other languages? (I could not find myself.) Thanks.
PHP Laravel, Ruby on Rails, Python Django, Elixir Phoenix all have some ways of doing this, but are usually baked into the framework.
Others usually end up as a standalone service like Keycloak, Authelia and more.
Sounds like there's not much like this for Java or C#.
1: https://docs.oracle.com/en/java/javase/22/security/java-auth...