nodecat is a tiny Node.js utility that implements the POSIX `cat` command exactly as specified—reading files (or stdin) and writing them byte‑for‑byte to stdout without any buffering, encoding conversion, or extra features. It can be used from the command line or as an asynchronous library function, making it useful for developers who need a faithful, non‑blocking `cat`‑like concatenation tool in JavaScript/Node environments.