Auth51: Passwordless Code Sign In

A centered passwordless card that advances in place from a work email step with an SSO fallback to a monospace one-time-code entry with resend and go-back controls.

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/auth51?email=YOUR_EMAIL&license_key=YOUR_KEY"

Base UI flavor

npx shadcn add "https://ui.beste.co/r-base/auth51?email=YOUR_EMAIL&license_key=YOUR_KEY"

This installs the block to components/beste/block/auth51.tsx, the shadcn/ui input component it depends on, and the button21 component it uses for the actions.

Quick start

The installed file exports auth51Demo alongside the block: the exact props behind the preview above. Spread it to get a working sign-in page in one line.

import { Auth51, auth51Demo } from "@/components/beste/block/auth51";

export default function SignInPage() {
  return <Auth51 {...auth51Demo} />;
}

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

import { Auth51 } from "@/components/beste/block/auth51";

export default function SignInPage() {
  return (
    <Auth51
      wordmark="sirius"
      emailStep={{
        heading: "Sign in without a password",
        description: "We send a six-digit code that works once and expires in ten minutes.",
        label: "Work email",
        placeholder: "you@practice.com",
        submitLabel: "Send me a code",
        dividerLabel: "or",
        ssoButton: { label: "Use your practice identity provider", href: "/auth/sso" },
      }}
      codeStep={{
        heading: "Check your email",
        description: "It is valid for ten minutes and can only be used once.",
        length: 6,
        resendLabel: "Send it again",
        submitLabel: "Sign in",
        backLabel: "Use a different email",
      }}
      footer={{ label: "No workspace yet?", link: { label: "Create one", href: "/signup" } }}
    />
  );
}

Props

type EmailStep = {
  heading: string;
  description: string;
  label: string;
  placeholder: string;
  submitLabel: string;
  dividerLabel: string;
  ssoButton: { label: string; href: string };
};

type CodeStep = {
  heading: string;
  description: string;
  length: number;
  resendLabel: string;
  submitLabel: string;
  backLabel: string;
};

type FooterLink = {
  label: string;
  link: { label: string; href: string };
};

Behavior notes

• The two steps are one boolean of local state. The submit button on step one sets it to true with no validation and no network call, so the demo advances on any click. Wiring a real send means replacing that handler.
• The back control sets the same boolean to false, so the card returns to the email step in place. Nothing is preserved between steps, since neither field is controlled.
• The step is swapped by conditional render, not hidden with CSS, so only one step exists in the DOM at a time and the code inputs are freshly mounted each visit.
• codeStep.length drives how many single-character inputs are rendered. Each gets maxLength={1} and an aria-label reading "Digit 1", "Digit 2" and so on, and only the first carries the generated id.
• There is no auto-advance between digit boxes and no paste handling. Both are deliberate omissions, since they depend on your validation flow.
• The digit inputs keep font-mono, which is the one place the set uses a monospace face on purpose: fixed-width digits stop the boxes from jittering as characters are typed.
• The resend button has no handler at all. It is a real button so it is focusable and styled correctly, and the resend call is yours to add.