What does the useId hook do in React, and in which scenarios should it be used?

The useId hook is used to generate stable and unique IDs for elements inside a component.
This is especially useful for accessibility, such as correctly linking form inputs with their labels.

The IDs created by useId remain consistent across re-renders and are unique across the application, even when the same component is rendered multiple times.

import { useId } from 'react';

function FormField() {
  const id = useId();

  return (
    <>
      <label htmlFor={id}>Email</label>
      <input id={id} type="email" />
    </>
  );
}

This ensures the label is correctly linked to the input.

Why useId is needed

In React, generating IDs manually (like using Math.random() or array indexes) can cause:

ID mismatches during SSR
Accessibility issues
Unstable IDs between renders

useId solves this by creating predictable and consistent IDs.

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