signup_disabled - Better Auth

This error occurs when you disable sign up in your oauth provider config and a user tries to sign up with that provider.

How to fix

If you're using the disableSignUp option with stateless mode, you will see this error. Please consider using database hooks instead to handle this case.

import { betterAuth } from "better-auth";
import { APIError } from "better-auth/api";

export const auth = betterAuth({
  databaseHooks: {
    user: {
      create: {
        before: async (user, ctx) => {
          const isAllowedToSignUp = await isAllowedToSignUp(user, ctx); // [!code highlight] // check if the user is allowed to sign up
          if (!isAllowedToSignUp) {
            throw new APIError("BAD_REQUEST", {
              message: "Signup is disabled",
			});
          },
        },
      },
	},
  }
});