How do you normally add user authentication to your Saas project?

I'm working on a new project with Nuxt.JS and I'm wondering what's the best or easiest way to user authentication (login/register)? What are the options out there?

Firebase auth is the best. I have used it in both my SaaS websites Simple Ops and Visa List. For NuxtJS there is even a module of firebase which makes it pretty easy along with firebaseui library.

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