index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';
import { Auth0Provider } from "@auth0/auth0-react";

ReactDOM.render(
  <React.StrictMode>
    <Auth0Provider
      domain="YOUR_DOMAIN"
      clientId="YOUR_CLIENT_ID"
      redirectUri={window.location.origin}
    >
      <App />
    </Auth0Provider>
  </React.StrictMode>,
  document.getElementById('root')
);

serviceWorker.unregister();