Is there any way to authenticate users in React?

Basically the title. I see auth being used mainly on the server-side, but is there any way to use it on the client-side with ReactJS?

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sorry, that is not possible, you will need a backend to parse the header.


@Coder100 Yea, I'm using an Express backend right now, just for an API to connect to a database (Firestore). I don't want to go through all the redirects and stuff because my app is an SPA. is this still possible?