React API Integration

Learn to fetch data from APIs in React.

Using Fetch

function Users() {
  const [users, setUsers] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    fetch('https://api.example.com/users')
      .then(res => res.json())
      .then(data => {
        setUsers(data);
        setLoading(false);
      })
      .catch(err => {
        setError(err.message);
        setLoading(false);
      });
  }, []);

  if (loading) return <p>Loading...</p>;
  if (error) return <p>Error: {error}</p>;

  return (
    <div>
      {users.map(user => (
        <p key={user.id}>{user.name}</p>
      ))}
    </div>
  );
}

POST Request

const createUser = async (userData) => {
  const response = await fetch('https://api.example.com/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(userData)
  });
  return response.json();
};

With Axios

npm install axios

import axios from 'axios';

useEffect(() => {
  axios.get('https://api.example.com/users')
    .then(res => setUsers(res.data))
    .catch(err => setError(err.message));
}, []);

Remember

• Handle loading states
• Handle errors
• Clean up with AbortController
• Use try-catch with async/await

Next: Learn form validation!