Controlled Components in React

When building interactive applications, forms are essential for capturing user data. However, relying on direct DOM manipulation to manage inputs often leads to unpredictable results and scattered logic. React introduces a more reliable pattern called controlled components — where every input field’s value is derived from the component’s state. This approach makes form data predictable, easier to debug, and fully aligned with React’s declarative model.

In a controlled form, React takes full control of the input’s value. The input element reflects state, and every change updates that state through event handlers. This two-way synchronization ensures that the UI always mirrors the underlying ...