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In Next.js, you can obtain the previous URL using the useRouter hook from the next/router module. You can then access the previous URL using the asPath property of the router object. Here's an example:

import { useRouter } from 'next/router';

function MyComponent() {
  const router = useRouter();
  const { asPath } = router;

  // use `asPath` as needed

  return <div>...</div>;
}

The asPath property contains the previous URL as a string, including any query parameters or hash fragments. Note that this value is only available when using the client-side router, so it may be undefined on the initial request.