haraka‑config is a lightweight library used by the Haraka mail server and its plugins to load, parse, cache and watch configuration files. It supports many file formats (plain values, lists, ini, json, hjson, yaml, binary) and lets plugins retrieve configs with automatic reload callbacks and per‑plugin default/override handling, making it ideal for developers building Haraka plugins or any Node.js app that needs flexible, hot‑reloading configuration.