TutorialsUser authentication

User authentication

FastSaas uses NextAuth to authenticate users. You can configure it in the /app/api/auth/[...nextauth]/route.js file.

There are 2 built-in ways to authenticate users with FastSaas: Magic Links & Google Oauth.

Once you’ve completed at least one of the tutorials above, you can login users like this:

ButtonSignin.js
"use client";
 
import { signIn } from "next-auth/react";
import config from "@/config";
 
const SigninButton = () => {
  return (
    <button
      className="btn btn-primary"
      onClick={() =>
        signIn(undefined, { callbackUrl: config.auth.callbackUrl })
      }
    >
      Login
    </button>
  );
};
 
export default SigninButton;
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The callbackUrl variable in the config.js file is used accross the app to redirect the user at the right place after a successfull sign-up/login. It’s usually a private page like /dashboard

Static pageAPI call