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 is state-of-the-art for Auth as a service. Some known alternatives are the following:

Personally, I built a simple Express server with Passport JS and I re-use it for my projects. It took me almost 1 week and I had very little backend dev experience. The main reason was to eliminate the external services / cost I use for my indie products!

However, I'd recommend Firebase to get your job done in no time!

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