Why useImperativeHandle is Needed in React

useImperativeHandle is a React hook that allows controlling which methods and properties will be available to parent when using ref on child component.

It's used together with forwardRef to configure external interface for accessing internal component functions/values.

Syntax

useImperativeHandle(ref, () => ({
  // methods that will be accessible from outside
  someMethod() {
    // ...
  },
}), [dependencies]);

• ref — reference passed through forwardRef.
• Function () => ({...}) returns object with public API.
• [dependencies] — dependency list for object updates.

When useImperativeHandle is Needed

• When you want to limit access to internal component functions (encapsulation).
• When you need to expose child component methods to parent (e.g., focus, reset, scrollToTop, etc.).
• When working with non-standard or complex DOM elements, custom components, modal windows, etc.

Example: accessing focus method from parent

import React, { useRef, useImperativeHandle, forwardRef } from 'react';

const CustomInput = forwardRef((props, ref) => {
  const inputRef = useRef<HTMLInputElement>(null);

  useImperativeHandle(ref, () => ({
    focus: () => {
      inputRef.current?.focus();
    },
    clear: () => {
      inputRef.current!.value = '';
    }
  }));

  return <input ref={inputRef} {...props} />;
});

export default function App() {
  const inputRef = useRef<{ focus: () => void; clear: () => void }>(null);

  return (
    <div>
      <CustomInput ref={inputRef} />
      <button onClick={() => inputRef.current?.focus()}>Focus</button>
      <button onClick={() => inputRef.current?.clear()}>Clear</button>
    </div>
  );
}

Conclusion

useImperativeHandle is an advanced React tool used in cases when you need to explicitly configure component access interface via ref. This is convenient for creating controlled components, modal windows, custom inputs and other situations where parent needs to directly manage child behavior.