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JavaScript definitely has a few such OpenAuthJS, Better-Auth, and Next-Auth.

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.

Thanks.

Sounds like there's not much like this for Java or C#.

I think the most similar you'd find for Java are Shiro [0], Java Authentication and Authorization Service (JAAS) [1], and pac4j [2].

Thanks!