SuperTokens is an open source authentication solution offering features like: Different types of login: Email / password, Passwordless (OTP or Magic link based).

SuperTokens.com

Is there a way to restrict sign in to allow emails only from a specific domain when using sign in with google <@498057949541826571>

hey <@1154415150711971890> there is. You need to use google workspaces login, and you can specify the domain there.

can't we restrict it in the signinup function by overriding it

override the signinup function which has the email as the input