`normalize-registry-metadata` is a small Node.js utility that sanitizes package metadata objects retrieved from npm’s change‑feeds or raw registry dumps. It mutates the given object in‑place, cleaning version strings (using `semver.clean`), fixing `dist-tags`, stripping obsolete `ctime`/`mtime` fields, and optionally rewriting tarball URLs, making the data safe for consumption by npm clients or other tools that expect the same shape as the official npm registry API. It’s aimed at developers building tooling around npm registry data, such as mirrors, analytics pipelines, or CI systems.