# [Garmr](https://en.wikipedia.org/wiki/Garmr) > In Norse mythology, Garmr or Garm (Old Norse: Garmr [ˈɡɑrmz̠]; "rag") is a wolf or dog associated with both Hel and Ragnarök, and described as a blood-stained guardian of Hel's gate. Garmr is the backend of fwlnx, guarding the system from invalid configurations. It takes the users configuration via a HTTP API and feeds it into the NixOS config to setup the whole system. # API endpoints ## `GET /config` Gives you the current configuration as json. ## `PUT /config` Upload a json configration to this endpoint to reconfigure fwlnx. --- Made with ❤️‍🔥 and 🐹.