Is It Better to Use Multiple States or One State Object in React?

To use multiple state variables or a single state object in React depends on the the complexity of your component and organization of your data.

1. Multiple State Variables

If your component has relatively independent pieces of state that don’t interact with each other and changing one doesn’t affect the others, than you should opt for Multiple State Variables.

To use multiple state variables or a single state object in React depends on the complexity of your component and the organization of your data.function Counter()

{
  const [count, setCount] = useState(0);
  const [isActive, setIsActive] = useState(false);
  // ...
}

2. Single State Object

If your component has a more complex state structure with interdependent pieces of data, you might benefit from using a single state object. This can help in keeping related data together and managing updates more effectively.

function UserProfile() {
  const [user, setUser] = useState({
    name: "John Doe",
    age: 25,
    email: "[email protected]",
  });
  // ...
}

It’s also important to consider the principle of minimizing unnecessary re-renders. When you update a state variable, the entire component re-renders. If different pieces of state are updated separately, they might trigger unnecessary re-renders. In such cases, using the useReducer hook or a state management library like Redux could be more suitable.

Find more about state structure on React official site.