RandStream is a small Node.js library that provides a readable stream continuously emitting random‑looking bytes. It supports several modes (true random, pseudo‑random, zero‑filled, binary “0/1”, alphabetic or numeric streams, and a pregenerated buffer) and can be used programmatically or via a CLI (`rand`) for testing, benchmarking, or any situation where a fast source of arbitrary data is needed. It targets developers who need a simple, configurable source of random or patterned byte streams in Node applications or command‑line workflows.