I had been using Jellyfin as a user and an admin for about a year and wanted an excuse to learn how it works from the inside. JellyFlare is that excuse: a server-side plugin that posts an announcement across the top of the web UI, where the household sees it instead of scrolling past another Discord ping.
There is a caveat. JellyFlare is web-only, plus the embedded client. Every other Jellyfin client (mobile, Roku, Android TV, the rest) is its own codebase, with no shared “show this banner everywhere” hook to plug into. So the plugin runs on the server, injects into the web UI, and that is the reach. For the household that covers the screens where announcements would land anyway. For a TV-first install, it does not.
Stack: C# (.NET), Jellyfin plugin API, HTML/CSS for the injected banner Code: github.com/MorganKryze/JellyFlare