Build your own sign-in-or-up page for your React Router app with Clerk

Build a sign-in-or-up page
Configure routes
Configure redirect behavior
Visit your new page
Next steps

Available in other SDKs

This guide shows you how to use the <SignIn /> component to build a custom page that allows users to sign in or sign up within a single flow.

To set up separate sign-in and sign-up pages, follow this guide, and then follow the custom sign-up page guide.

The following example demonstrates how to render the <SignIn /> component on a dedicated page using the React Router Splat route.

app/routes/sign-in.tsx

import { SignIn } from '@clerk/react-router'

export default function SignInPage() {
  return (
    <div>
      <h1>Sign in or up route</h1>
      <SignIn />
    </div>
  )
}

Configure routes

React Router expects you to define routes in app/routes.ts. Add the previously created sign-in-or-up page to your route configuration.

app/routes.ts

import { type RouteConfig, index, route } from '@react-router/dev/routes'

export default [
  index('routes/home.tsx'),
  route('sign-in/*', 'routes/sign-in.tsx'),
] satisfies RouteConfig

Configure redirect behavior

Set the CLERK_SIGN_IN_URL environment variable to tell Clerk where the <SignIn /> component is being hosted.
Set CLERK_SIGN_IN_FALLBACK_REDIRECT_URL as a fallback URL incase users visit the /sign-in route directly.
Set CLERK_SIGN_UP_FALLBACK_REDIRECT_URL as a fallback URL incase users select the 'Don't have an account? Sign up' link at the bottom of the component.

Learn more about these environment variables and how to customize Clerk's redirect behavior in the dedicated guide.

.env

CLERK_SIGN_IN_URL=/sign-in
CLERK_SIGN_IN_FALLBACK_REDIRECT_URL=/
CLERK_SIGN_UP_FALLBACK_REDIRECT_URL=/

Visit your new page

Run your project with the following command:

npm

pnpm

yarn

bun

terminal

npm run dev

terminal

pnpm run dev

terminal

yarn dev

terminal

bun run dev

Visit your new custom page locally at localhost:5173/sign-in.

Next steps

Learn more about Clerk components, how to use them to create custom pages, and how to use Clerk's client-side helpers using the following guides.

Create a custom sign-up page

Learn how to add a custom sign-up page to your React Router app with Clerk's components.

Protect content and read user data

Learn how to use Clerk's hooks and helpers to protect content and read user data in your React Router app.

Client-side helpers

Learn more about Clerk's client-side helpers and how to use them.

Prebuilt components

Learn how to quickly add authentication to your app using Clerk's suite of components.

Clerk React Router SDK Reference

Learn about the Clerk React Router SDK and how to integrate it into your app.

Last updated on Feb 10, 2026

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Build your own sign-in-or-up page for your React Router app with Clerk

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