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CourierAPI.send() and CourierAPI.broadcast() to send notifications to playersCourierClientAPI.showLocal() for client-only mods and singleplayercouriernotifications.json — define reusable named notifications in the server rootcouriernotifications_queue.json — trigger notifications externally (scripts, RCON, panels) without touching Java code/courier send <id> — broadcast a named notification to all online players (op level 2)/courier reload — reload couriernotifications.json from disk without restarting the server/courier send
CourierAPI is a Fabric mod library that lets any mod send animated HUD notification cards to players — via the Java API, JSON files, or in-game commands. Supports server-to-client broadcasting and client-side local display.