frontend/src/App.js

import React from 'react';

function App() {
    const [message, setMessage] = React.useState("");

    React.useEffect(() => {
        fetch("/api")
            .then(response => response.json())
            .then(data => setMessage(data.message));
    }, []);

    return (
        <div>
            <h1>{message}</h1>
        </div>
    );
}

export default App;