in rails you can use the rails 8 auth or a better alternative authentication-zero. before it was devise.
java - spring security, shiro etc. but just complex things.
alternatively - use services like fusionAuth
Auth.js is actually one of the first attempts that tries to be framework and vendor agnostic while still including a good deal of the batteries you need to make a full authentication system, which they only recently did, as they were originally tied to next JS like every other library in the graveyard of authentication libraries.
If you just want to specifically do an OAuth handshake or salt and hash a password or produce a JWT, those libraries are all rock solid. But a full batteries included framework and vendor agnostic solution hasn’t really existed until recently.
Anything that can help me utilize oauth standards is fine to me.
For example, if I want to add passkeys to my .NET CORE app, this is the guide Microsoft provides:
https://learn.microsoft.com/en-us/aspnet/core/security/authe...
Contrast that to better-auth (which is 7 lines of code total in server changes, and virtually no change to client API usage):
https://www.better-auth.com/docs/plugins/passkey
For some projects, the flexibility of other solutions might be needed. But for ease-of-use and development speed, better-auth has been a clear winner for me.
So it basically has no difference from the alternatives you mentioned.
It's convenient, I'll give them that. Secure? https://projectdiscovery.io/blog/nextjs-middleware-authoriza...