Best for
Founders who need a polished login UI fast, before wiring it to real auth
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A ready-made Login Screen UI you can fork, run, and customize with the prompt pack below.
What's actually inside
The honest engineer's breakdown — what the Login Screentemplate does, how it's wired, and where it's opinionated.
The Login Screen template is a single-focus auth page: one shadcn/ui Card centered on a clean background with two fields, a submit button, and conditional error display. The Email Input uses shadcn/ui Input with type='email' and a Label, controlled by react-hook-form. The Password Input adds a show/hide toggle using the Eye icon from lucide-react — a small detail that dramatically improves UX for mobile users.
The Submit Button uses shadcn/ui Button and shows a loading spinner while the form is submitting, preventing double-submits. A shadcn/ui Alert renders conditionally for wrong credentials or network errors — but only if you wire the error state correctly (one of the gotchas below). A 'Forgot password' link sits below the form as a plain anchor styled text-primary hover:underline.
Honest caveat: the template has no server-side auth wiring out of the box — the submit button does nothing until you add a Server Action or Clerk/Supabase hook. The 'Forgot password' link also goes nowhere; you need to create a reset page yourself. State persistence (Remember me) requires localStorage, which throws during SSR if placed in the component body rather than a useEffect.
Key UI components
Login Cardshadcn/ui Card centered on page, containing all form elements
Email Inputshadcn/ui Input with type='email' and Label, controlled by react-hook-form
Password Inputshadcn/ui Input type='password' with Eye icon show/hide toggle from lucide-react
Submit Buttonshadcn/ui Button showing a loading spinner during form submission
Error Alertshadcn/ui Alert shown conditionally for wrong credentials or network errors
Forgot Password LinkAnchor styled as text-primary hover:underline below the form
Libraries it leans on
react-hook-formForm state management, field registration, and isSubmitting loading state
zodEmail format and password minimum length schema validation via zodResolver
Fork it and get it running
This is a Beginner template — the fork takes about 5 minutes and you can have a branded, deployed login page before choosing your auth provider.
Open and Fork
Go to https://v0.dev/chat/community/QgiMxaR9ag3. The preview shows the centered login card with email, password, and a submit button. Click the 'Fork' button in the top-right corner. V0 copies all source files into a new project in your account. You need a free V0 account to fork.
You should see: A new V0 project opens with the Login Screen source code and the live preview loaded.
Brand It in Design Mode
Press Option+D (Mac) to open Design Mode. Replace the placeholder logo or 'Logo' text in the Login Card header with your product name or an img tag pointing to /logo.svg. Update the card headline from 'Welcome back' to your product's equivalent. Change the brand color on the Submit Button and any accent elements. Design Mode changes are free — no credits consumed.
Tip: The card background and border color are the two most impactful visual changes you can make here.
You should see: The preview shows your logo, updated headline, and brand colors on the Login Card.
Add Zod Validation
Type this prompt: 'Add Zod validation: email must be a valid email format, password must be at least 8 characters; wire zodResolver to react-hook-form; display inline error messages below each field using FormMessage from shadcn/ui Form components.' V0 updates the schema and wires FormMessage under both inputs so users see errors before they hit Submit.
Tip: This prompt works even if V0 already has a partial Zod schema — it will upgrade it to show inline errors.
You should see: Both inputs show inline error messages below them when validation fails, before form submission.
Wire to Your Auth Provider
Add your auth credentials in the Vars panel (click the Vars icon in the V0 toolbar): for Clerk add NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY and CLERK_SECRET_KEY; for Supabase add NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY. Never paste API keys into the V0 chat. Then prompt V0 to wire the form — use one of the auth prompts from the prompt pack below.
You should see: The submit handler calls your auth provider. On success the user is redirected to /dashboard; on failure the Error Alert appears.
Publish to Production
Click Share → Publish → 'Publish to Production.' Vercel builds and deploys in under 60 seconds and gives you a live Vercel subdomain URL. Test the login flow end-to-end from the deployed URL — OAuth redirects in particular must be tested on the real domain, not the V0 preview.
You should see: A live URL is available. Signing in with a test account redirects to /dashboard successfully.
Update OAuth Callback URLs
If you added Google OAuth or any social login, go to your auth provider's dashboard and add the Vercel production domain to the list of allowed callback URLs. For Clerk, go to Clerk Dashboard → Domains. For Supabase, go to Supabase Dashboard → Auth → URL Configuration → Redirect URLs. Missing this step causes OAuth to fail with a redirect URI mismatch error on the production domain.
Tip: Add your custom domain here too if you plan to attach one later — you'll avoid a second round-trip to the provider dashboard.
You should see: OAuth logins work on the production Vercel domain without redirect URI errors.
The prompt pack
Copy-paste these straight into v0's chat to customize the Login Screentemplate. Each one names this template's own components — no generic filler.
Add a logo and brand colors
Applies your brand identity to the Login Card in under a minute without touching any form logic.
Replace the placeholder 'Logo' text in the Login Card header with an img tag pointing to /logo.svg with className='h-8 w-auto'. Update the Submit Button background to brand hex #1D4ED8 and add a matching border to the Login Card. Change the page background from white to slate-50. Keep all form fields, the Error Alert, and the Forgot Password link in their current positions.
Add a Remember Me checkbox
Adds a persistent email pre-fill so returning users skip typing their email on repeat visits.
Add a shadcn/ui Checkbox labeled 'Remember me' below the password input and above the Submit Button. Register it with react-hook-form. When checked, store the email value in localStorage using a useEffect so the Email Input pre-fills on next visit — wrap the localStorage.getItem call inside a useEffect that runs only after component mount to prevent SSR errors. Never store the password in localStorage.
Add inline form validation with error messages
Adds real-time inline validation to both the Email Input and Password Input so users see errors before they try to submit.
Add a Zod schema: email must pass z.string().email(), password must pass z.string().min(8, 'Password must be at least 8 characters'). Wire zodResolver to the useForm instance. Display inline validation errors below each field using FormMessage from shadcn/ui Form components. Set mode: 'onBlur' on useForm so errors appear as the user moves between fields rather than waiting for submit.
Wire to Clerk authentication
Connects the Login Card form to Clerk's sign-in flow so real users can authenticate with email and password.
Install @clerk/nextjs. Wrap the root layout in ClerkProvider with NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY from the Vars panel. In the Login Card form component (marked 'use client'), use the useSignIn hook: const { signIn, setActive } = useSignIn(). On submit, call signIn.create({ identifier: email, password }) and on success call setActive with the createdSessionId then redirect to /dashboard using useRouter. Display the Clerk error.message string in the Error Alert on failure.Wire to Supabase Auth
Connects the Login Card to Supabase Auth with cookie-based session management and route protection.
Install @supabase/supabase-js and @supabase/ssr. Add NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY to the Vars panel. Create lib/supabase-browser.ts with createBrowserClient from @supabase/ssr. In the Login Card submit handler, call supabase.auth.signInWithPassword({ email, password }). On success call supabase.auth.getSession() and redirect to /dashboard. On error, display the Supabase error.message in the Error Alert. Create middleware.ts using createServerClient from @supabase/ssr to protect the /dashboard route and redirect unauthenticated users back to /login.Add Google OAuth button
Adds a one-click Google Sign-In button to the Login Card as an alternative to email and password.
Add a shadcn/ui Button variant='outline' above the email field with a Google SVG icon and label 'Continue with Google'. Add a horizontal 'or' divider between the OAuth button and the email form. Wire the Google button to supabase.auth.signInWithOAuth({ provider: 'google', options: { redirectTo: process.env.NEXT_PUBLIC_SITE_URL + '/auth/callback' } }). Create app/auth/callback/route.ts to exchange the OAuth code for a session and redirect to /dashboard. Add NEXT_PUBLIC_SITE_URL to the Vars panel pointing to your production domain.Gotchas when you extend it
The failures people actually hit when they push this template past its defaults — and the exact fix for each.
`ReferenceError: localStorage is not defined` for Remember MeWhy: V0 often places localStorage.getItem calls in the component render body. Next.js SSR runs the component in Node.js where localStorage doesn't exist, so the page crashes on server render.
Fix: Move the localStorage.getItem call for pre-filling the email into a useEffect hook that runs only after mount.
Move the localStorage.getItem('saved-email') call inside a useEffect hook that runs only after component mount to prevent SSR errors in the Login Card.OAuth redirect URI mismatch on Vercel preview deploymentsWhy: Vercel preview URLs change per branch (e.g. project-xyz-abc.vercel.app). Most auth providers require exact static callback URLs, so OAuth fails on every new preview deployment.
Fix: Use the production domain for OAuth callbacks. For Clerk, add a wildcard domain pattern in the Clerk Dashboard. For Supabase, add the specific preview URL to Additional Redirect URLs in Auth → URL Configuration.
Add the Vercel preview URL to the list of authorized redirect URIs in your OAuth provider dashboard; for Clerk, use the wildcard domain pattern in the Clerk Dashboard.
Login form submits but shows no error on wrong passwordWhy: Server Actions throw errors rather than returning them; the error never reaches the client's Error Alert component, so users see a stuck loading state with no feedback.
Fix: Update the Server Action to return an error object instead of throwing: return { error: 'Invalid credentials' }. Check if (result?.error) in the client component to display the Error Alert.
Update the Server Action to return an error object instead of throwing: return { error: 'Invalid credentials' }; then in the Login Card component check if (result?.error) to conditionally show the Error Alert.Submit Button stays in loading state after auth errorWhy: If the form handler throws without being caught, react-hook-form's isSubmitting state stays true indefinitely and the Submit Button spinner never stops.
Fix: Wrap the submit handler in try/catch; call setIsLoading(false) in the catch block to reset the button state.
Wrap the form submit handler in try/catch; call setIsLoading(false) in the catch block so the Submit Button exits its loading spinner on any auth error.
Template vs. custom — the honest call
A forked template gets you far, fast. Here's where it holds up, and where you'll outgrow it.
The template is enough when
- MVP login page before you've decided on an auth provider
- Design handoff to a developer showing the login UX pattern
- A/B test comparing email+password against a 'Continue with Google' flow
- SaaS app early-access gate for a beta waitlist
Go custom when
- You need magic link (passwordless) flows with email delivery via Resend or Postmark
- Biometric auth (passkeys/WebAuthn) for mobile-first products
- Enterprise SSO with SAML via Okta or Azure Active Directory
- MFA/TOTP with time-based one-time codes as a mandatory second factor
RapidDev wires your V0 login screen to Clerk or Supabase Auth, adds protected routes, and delivers a complete auth flow — usually in 1–2 days.
Frequently asked questions
Is the Login Screen v0 template free to use?
Yes. All v0.dev community templates are free to fork with a free account. The generated code has no licensing fees. shadcn/ui, react-hook-form, and Zod are all MIT-licensed.
Can I use this template commercially in a paid product?
Yes. The code V0 generates is yours to use commercially without restriction. You're using standard open-source libraries (shadcn/ui, react-hook-form, Zod) — all MIT. Just don't republish the template on v0.dev community as an original creation.
Why does my fork break in V0 preview when I add Supabase?
V0's preview sandbox resolves packages through esm.sh. The @supabase/ssr package sometimes fails to resolve there, showing 'Import Error | Failed to load from blob...'. This is a sandbox limitation only — the code works correctly after deployment to Vercel. Click Share → Publish to Production and test the login flow on the deployed URL.
Which auth provider should I use — Clerk or Supabase Auth?
Clerk is faster to set up (3-4 lines of code, hosted UI components) and has better social auth support out of the box. Supabase Auth is better if you're already using Supabase for your database — everything lives in one project with shared RLS policies. For a pure UI fork with no backend yet, try Clerk first.
How do I add a Forgot Password page?
The 'Forgot password' link is a plain anchor in the template. Prompt V0: 'Add a /forgot-password page with an email input and a submit button; on submit call supabase.auth.resetPasswordForEmail(email, { redirectTo: siteUrl + "/auth/callback?next=/update-password" }); show a confirmation message.' This creates the page and wires the Supabase password reset flow.
Why does the Remember Me checkbox cause an SSR error?
V0 sometimes places localStorage.getItem() in the component body, which runs during Next.js server-side rendering where localStorage doesn't exist. Wrap all localStorage reads in a useEffect hook with an empty dependency array — this ensures they only run in the browser after the component mounts.
Can RapidDev connect this Login Screen to my auth provider?
Yes. RapidDev wires your V0 login screen to Clerk or Supabase Auth, adds protected route middleware, configures the OAuth callbacks, and delivers a complete working auth flow — usually in 1–2 days.
How do I add a Sign Up page to match this Login Screen?
Prompt V0: 'Add a /signup page that mirrors the Login Card layout but with email, password, and confirm-password fields; wire it to the same auth provider; add a "Already have an account? Sign in" link below the Submit Button.' V0 generates the page and links both directions.
Outgrowing the template?
RapidDev turns v0 prototypes into production apps — real auth, database, and payments — at $13K–$25K.
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