client/app.jsx


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import { useState } from 'react';
import { setConstantValue } from 'typescript';

const App = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');

  const submit = () => {
    fetch('/sign_in', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ email, password }),
    });
  };

  return (
    <>
      <div>
        <input
          type="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
        />
      </div>
      <div>
        <input
          type="password"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
        />
      </div>
      <button type="button" onClick={submit}>Login</button>
    </>
  );
};

export default App;