Clean Code: Best Practices for Maintainable React Apps in 2026

Building a React app is easy. Maintaining a React app after two years of changes, multiple developers, and scaling requirements is notoriously hard.

The Single Responsibility Rule in UI

A component should do one thing. If a component is responsible for fetching data, managing complex form state, and rendering nested UI elements, it is time to break it down.

“UI components should focus on layout. Move business logic, data mutation, and states into custom hooks to make the UI simple and clean.”

— Ananya Sharma

// Custom hook pattern example
export function useUserData(userId) {
  const [user, setUser] = useState(null);
  useEffect(() => {
    fetchUser(userId).then(setUser);
  }, [userId]);
  return user;
}