Simple chat stickers

Players can send stickers in chat and add custom sticker packs to use alongside the built-in options. A pack is installed by placing its ZIP archive in a sticker-packs folder inside the main game directory, and the sticker images then become available in chat. Because the mod is Fabric-only and client-side, a player who joins a server needs nothing more than the mod itself.

Creating a sticker pack means building a ZIP archive with a pack.json file at its root. That file gives the pack's name and lists its stickers, and each sticker image in the archive must be referenced by its correct relative path inside pack.json. Each sticker carries a unique code made of a random set of characters, and the code is what appears as plain text in chat for anyone who does not have the matching pack installed, so the message still reads sensibly without the mod.