The Problem: Exposing Only What’s Needed
By default, attaching a ref to a custom component doesn’t work at all — refs only attach to DOM elements unless the component explicitly forwards one. Even when forwarded, giving the parent direct access to the entire underlying DOM node exposes far more than it usually needs.
What useImperativeHandle Does
useImperativeHandle lets a component define exactly what value should be exposed when a parent attaches a ref to it — typically a small object with only a couple of specific methods, instead of the whole raw DOM node.
Exposing a Limited API from an Input
import { useRef, useImperativeHandle } from "react";
function CustomInput({ ref, ...props }) {
const inputRef = useRef(null);
useImperativeHandle(ref, () => ({
focus() {
inputRef.current.focus();
},
clear() {
inputRef.current.value = "";
},
}));
return <input ref={inputRef} {...props} />;
}
function Form() {
const inputRef = useRef(null);
return (
<>
<CustomInput ref={inputRef} />
<button onClick={() => inputRef.current.focus()}>Focus</button>
<button onClick={() => inputRef.current.clear()}>Clear</button>
</>
);
}Why Not Just Expose the Whole DOM Node?
Exposing the raw input element would let a parent do anything to it directly — change its style, remove it, read arbitrary properties — tightly coupling the parent to the component’s internal implementation. Exposing only focus() and clear() keeps a clean, intentional boundary between the two.
Older React Versions Needed forwardRef
Before React 19, a component had to be wrapped in forwardRef() to accept a ref prop at all. As of React 19, function components can accept ref directly as a regular prop, removing the need for forwardRef in most cases — useImperativeHandle still works the same way regardless.
Use Sparingly
Reaching for imperative APIs (focus(), clear(), scrollIntoView()) works against React’s declarative model. It’s appropriate for genuinely imperative browser behaviors, but state and rendering should still flow through props and state wherever possible.
Best Practice
Only expose the smallest possible imperative API a parent actually needs — a couple of named methods — rather than the whole underlying DOM node or component instance.