auth0-react

par auth0

Authentification pour les applications monopages React utilisant la connexion universelle Auth0 avec des flux basés sur la redirection. Prend en charge React 16 à 19 avec Vite ou Create React App ; enveloppe votre application avec Auth0Provider et expose des hooks comme useAuth0(), loginWithRedirect() et logout(). Gère automatiquement les sessions utilisateur, les jetons d'accès et les données de profil ; le SDK gère le stockage sécurisé des jetons sans manipulation manuelle du localStorage. Inclut des routes protégées, l'injection de jetons API et des modèles de gestion des erreurs documentés dans le guide d'intégration...

npx skills add https://github.com/auth0/agent-skills --skill auth0-react

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Auth0 React Integration

Add authentication to React single-page applications using @auth0/auth0-react.

Prerequisites

React 16.11+ application (Vite or Create React App) - supports React 16, 17, 18, and 19
Auth0 account and application configured
If you don't have Auth0 set up yet, use the auth0-quickstart skill first

When NOT to Use

Next.js applications - Use auth0-nextjs skill for both App Router and Pages Router
React Native mobile apps - Use auth0-react-native skill for iOS/Android
Server-side rendered React - Use framework-specific SDK (Next.js, Remix, etc.)
Embedded login - This SDK uses Auth0 Universal Login (redirect-based)
Backend API authentication - Use express-openid-connect or JWT validation instead

Quick Start Workflow

1. Install SDK

npm install @auth0/auth0-react

2. Configure Environment

For automated setup with Auth0 CLI, see Setup Guide for complete scripts.

For manual setup:

Create .env file:

Vite:

VITE_AUTH0_DOMAIN=your-tenant.auth0.com
VITE_AUTH0_CLIENT_ID=your-client-id

Create React App:

REACT_APP_AUTH0_DOMAIN=your-tenant.auth0.com
REACT_APP_AUTH0_CLIENT_ID=your-client-id

3. Wrap App with Auth0Provider

Update src/main.tsx (Vite) or src/index.tsx (CRA):

import React from 'react';
import ReactDOM from 'react-dom/client';
import { Auth0Provider } from '@auth0/auth0-react';
import App from './App';

ReactDOM.createRoot(document.getElementById('root')!).render(
  <React.StrictMode>
    <Auth0Provider
      domain={import.meta.env.VITE_AUTH0_DOMAIN} // or process.env.REACT_APP_AUTH0_DOMAIN
      clientId={import.meta.env.VITE_AUTH0_CLIENT_ID}
      authorizationParams={{
        redirect_uri: window.location.origin
      }}
    >
      <App />
    </Auth0Provider>
  </React.StrictMode>
);

4. Add Authentication UI

import { useAuth0 } from '@auth0/auth0-react';

export function LoginButton() {
  const { loginWithRedirect, logout, isAuthenticated, user, isLoading } = useAuth0();

  if (isLoading) return <div>Loading...</div>;

  if (isAuthenticated) {
    return (
      <div>
        <span>Welcome, {user?.name}</span>
        <button onClick={() => logout({ logoutParams: { returnTo: window.location.origin } })}>
          Logout
        </button>
      </div>
    );
  }

  return <button onClick={() => loginWithRedirect()}>Login</button>;
}

5. Test Authentication

Start your dev server and test the login flow:

npm run dev  # Vite
# or
npm start    # CRA

Detailed Documentation

Setup Guide - Automated setup scripts (Bash/PowerShell), CLI commands, manual configuration
Integration Guide - Protected routes, API calls, error handling, advanced patterns
API Reference - Complete SDK API, configuration options, hooks reference, testing strategies

Common Mistakes

Mistake	Fix
Forgot to add redirect URI in Auth0 Dashboard	Add your application URL (e.g., `http://localhost:3000`, `https://app.example.com`) to Allowed Callback URLs in Auth0 Dashboard
Using wrong env var prefix	Vite uses `VITE_` prefix, Create React App uses `REACT_APP_`
Not handling loading state	Always check `isLoading` before rendering auth-dependent UI
Storing tokens in localStorage	Never manually store tokens - SDK handles secure storage automatically
Missing Auth0Provider wrapper	Entire app must be wrapped in `<Auth0Provider>`
Provider not at root level	Auth0Provider must wrap all components that use auth hooks
Wrong import path for env vars	Vite uses `import.meta.env.VITE_`, CRA uses `process.env.REACT_APP_`
Using `acr_values` redirect for in-app MFA	Use `useAuth0().mfa` API for in-app enrollment/challenge/verify flows
Not catching `MfaRequiredError`	Wrap `getAccessTokenSilently` in try/catch and check `instanceof MfaRequiredError`
Making direct HTTP calls to MFA endpoints	Use the `mfa` property from `useAuth0()` — it handles token management automatically
Forgetting refresh tokens for step-up MFA	Set `useRefreshTokens={true}` on Auth0Provider when using `interactiveErrorHandler="popup"`

Related Skills

auth0-quickstart - Basic Auth0 setup
auth0-migration - Migrate from another auth provider
auth0-mfa - Add Multi-Factor Authentication
auth0-cli - Manage Auth0 resources from the terminal

Quick Reference

Core Hooks:

useAuth0() - Main authentication hook
isAuthenticated - Check if user is logged in
user - User profile information
loginWithRedirect() - Initiate login
logout() - Log out user
getAccessTokenSilently() - Get access token for API calls
mfa - MFA API client for enrollment, challenge, and verification
- mfa.getAuthenticators(mfaToken) - List enrolled authenticators
- mfa.getEnrollmentFactors(mfaToken) - Get available enrollment factors
- mfa.enroll(params) - Enroll new authenticator (OTP, SMS, Email, Voice, Push)
- mfa.challenge(params) - Initiate MFA challenge
- mfa.verify(params) - Verify MFA challenge and complete authentication

MFA Error Types (import from @auth0/auth0-react):

MfaRequiredError - Thrown by getAccessTokenSilently when MFA is needed (has mfa_token and mfa_requirements)
MfaEnrollmentError, MfaChallengeError, MfaVerifyError - Thrown by respective mfa.* methods

Common Use Cases: