canihaz is a Node‑JS utility that lets libraries lazily require and automatically install optional or rarely‑used NPM packages at runtime, avoiding unnecessary bloat in `package.json`. It reads a custom key (default `canihaz`) in the host project's `package.json` to know which versions to install, then spawns npm to fetch missing modules and returns them via callbacks—ideal for developers building extensible tools or CLI extensions that only need certain dependencies on demand.