Node‑Units is a Node.js library that parses natural‑language conversion strings (e.g., “5 gills to mL”, “five days to seconds”) and returns the numeric result, using a built‑in unit database with support for prefixes, plural forms, and word‑based numbers. It also lets developers import or override custom unit definitions, making it useful for any JavaScript/Node projects that need flexible, extensible unit conversion without writing their own conversion logic.