passwordless VS next-auth

You mean like https://www.npmjs.com/package/passwordless ?

I can't give you a complete list, but hopefully this will help find what you're looking for: the approach that you describe is known as a "passwordless login", and it has been implemented in the past, e.g. in https://www.npmjs.com/package/passwordless (though the "magic link" is a popular name, too). The library itself has faded into obscurity, but it should be possible to find past discussions pertaining to your concerns.

NextAuth.js is not perfect. One of the shortcomings is that it currently does not implement federated logout. This means that even if a user signs out of the Next.js app, he does NOT get signed out of the Cognito user pool client. As a consequence, the user is not really being logged out (i.e he is able to login again without providing the credentials). You can read more about this problem in this Github thread.

NextAuth for adding auth

Let's learn a bit about Descope and how to use it with Auth.js (next-auth) to protect our Next.js app with role-based access control (RBAC).

https://github.com/nextauthjs/next-auth/issues/5647#issuecom...

Next Auth CognitoProvider Internal Library: https://github.com/nextauthjs/next-auth/blob/v4/packages/next-auth/src/providers/cognito.ts

I mentioned this in an age-old discussion on NextAuth GitHub repo.

Authentication is a fundamental part of most web applications. Integrating authentication into your Next.js app can be simplified with NextAuth, a powerful authentication library that supports various authentication methods. However, the documentation around setting up NextAuth with the "Credentials" auth provider might not be as clear as you'd hope. My implementation is greatly enriched and partially based on Next-Auth docs and the following github thread.

For Auth: https://authjs.dev/ - works like a charm with Svelte https://authjs.dev/reference/sveltekit

NextAuth.js

I'm surprised nobody mentioned https://authjs.dev/