Clerk Has a Free API That Adds Beautiful Auth to Any React App in 5 Minutes

Clerk is the auth platform that gives you pre-built UI components, session management, multi-factor auth, and user management — all with a simple React hook. Setup: One Provider import { ClerkProvider , SignIn , SignUp , UserButton } from " @clerk/nextjs " ; export default function App ({ children }) { return ( < ClerkProvider > { children } </ ClerkProvider > ); } Pre-Built Components // Sign in page — fully themed, customizable export default function SignInPage () { return < SignIn />; } // Sign up page export default function SignUpPage () { return < SignUp />; } // User button (avatar + dropdown) function Header () { return ( < nav > < h1 > My App </ h1 > < UserButton afterSignOutUrl = "/" /> </ nav > ); } useUser Hook: Client-Side Auth import { useUser , useAuth } from " @clerk/nextjs " ; function Dashboard () { const { user , isLoaded , isSignedIn } = useUser (); const { getToken } = useAuth (); if ( ! isLoaded ) return < Spinner />; if ( ! isSignedIn ) return < RedirectToSignIn