The **size‑limit‑stream** package is a Node.js Transform stream that monitors the cumulative data flowing through it and automatically destroys the pipeline once a configurable byte threshold is exceeded, protecting applications from oversized uploads (e.g., limiting HTTP request bodies). It’s aimed at developers who need built‑in size‑capping for streaming uploads—such as API services, file‑upload handlers, or any server‑side code that must enforce maximum request sizes without external middleware.