Auth21: Passkey Sign In

Full-height passwordless sign-in screen: a centered fingerprint icon and heading over a bordered card with a full-width "Continue with passkey" button, an optional divider, and a password fallback button beneath it. Built for WebAuthn and biometric authentication flows.

Installation

Swap YOUR_EMAIL and YOUR_KEY for the email and license key on your account. Find your license key on your account page.

Radix flavor

npx shadcn add "https://ui.beste.co/r/auth21?email=YOUR_EMAIL&license_key=YOUR_KEY"

Base UI flavor

npx shadcn add "https://ui.beste.co/r-base/auth21?email=YOUR_EMAIL&license_key=YOUR_KEY"

This installs the block to components/beste/block/auth21.tsx and the button and field shadcn/ui primitives it's built on.

Quick start

The installed file exports auth21Demo alongside the block: the exact props behind the preview above. Spread it to get a working passkey sign-in screen in one line.

import { Auth21, auth21Demo } from "@/components/beste/block/auth21";

export default function SignInPage() {
  return <Auth21 {...auth21Demo} />;
}

Then replace the demo with your own props. Written out, a trimmed setup looks like this:

import { Fingerprint } from "lucide-react";
import { Auth21 } from "@/components/beste/block/auth21";

export default function SignInPage() {
  return (
    <Auth21
      icon={<Fingerprint className="size-7" />}
      heading="Sign in with a passkey"
      description="Use your fingerprint, face, or device PIN to sign in securely."
      passkeyButton={{ label: "Continue with passkey", href: "/auth/passkey" }}
      alternativeButton={{ label: "Sign in with password", href: "/sign-in" }}
      signupPrompt={{ text: "Don't have an account?", linkLabel: "Sign up", href: "/sign-up" }}
      labels={{ divider: "or" }}
    />
  );
}

Props

type Auth21Labels = { divider?: string };

Behavior notes

• The passkey button always renders a Fingerprint icon inline before its label, independent of the icon prop used for the header circle above the card.
• The divider between the two buttons (built on FieldSeparator) renders only when labels.divider is set; omitting it collapses the card to just the passkey button stacked directly above the alternative button.
• Both passkeyButton and alternativeButton render as plain asChild next/link anchors; there is no navigator.credentials.get() call or any other WebAuthn wiring, so triggering the actual passkey ceremony is left to the integrator.
• signupPrompt renders through FieldDescription, matching the typographic treatment other auth cards in this family use for their bottom-of-card prompt line.