`normalize-exception` is a tiny utility that guarantees any thrown value becomes a proper JavaScript `Error` object. It fixes missing, invalid, non‑enumerable, read‑only or non‑configurable error properties (including `name`, `message`, `stack`, `cause` and `errors`) and works in Node ≥ 18 and browsers. It’s aimed at developers who need robust error handling in libraries or applications without worrying about malformed or non‑Error exceptions.