Node‑bigum is a pure‑JavaScript library that adds unrestricted‑size integer arithmetic to Node.js by leveraging OpenSSL’s built‑in big‑number primitives, so developers can perform arbitrary‑precision calculations without pulling in external dependencies like libgmp. It is aimed at anyone needing high‑precision math in Node—e.g., cryptographic algorithms, complex number theory, or large‑scale financial computations—who wants a lightweight, npm‑installable solution.