Another vote for Ory setup. It forces you a bit to go through it on your own, but you also learn a lot. There's Kratos for authentication, as well as Hydra for

Another vote for Ory setup. It forces you a bit to go through it on your own, but you also learn a lot. There's Kratos for authentication, as well as Hydra for federated authentication. Then, there's also Keto for authorization which is really nice and more flexible than Keycloak in certain things, and ultimately there's also Oathkeeper if you want things to be transparent to application developers. for example if you need roles defined per client and you have a lot of clients. In Keycloak that would be realm(s) and it's not really designed to have a lot of those. In Keto world it's all a function of queries, which admittedly can also be a bit of a challenge if you need to cache it and be part of a fast response chain (like high speed API).