APIs

You can interact with HFS in some ways:

HTTP

You can invoke REST APIs.

Since our interfaces are web-based, there's an API for almost anything. At the moment only a few are documented, but you can study others by looking into browser's dev-tools:

Javascript

While http requests are suitable for external software, you should consider also writing a plugin, or just writing some server code.

Files

Some files like config.yaml, custom.html and plugin.js are monitored, and reloaded at every change, without need to restart the server.