secure‑concat is a small Node.js utility that provides a writable stream which concatenates incoming Buffer chunks into a single Buffer. It adds safety features missing from other concat‑stream implementations: a configurable byte‑size limit to prevent oversized payloads, and automatic cleanup that overwrites the original Buffers with zeros after they’re processed (or on error). It’s aimed at developers who need a simple, memory‑secure way to gather streamed binary data—e.g., in servers or CLI tools handling user‑supplied input.