Sticker packs are .zip archives that need to be placed in the "sticker-packs" folder inside your main game directory.

.minecraft > sticker-packs > [packs... (.zip)]

The ZIP archive must contain a pack.json file that defines the pack's name and all included stickers. Sticker images (.png) can be organized inside the archive however you like, just make sure to specify the correct relative paths to them in the pack.json file.

pack.json Structure:

{
  "name": "[sticker pack name]",
  "stickers": {
    "[sticker code]": "[relative path to the sticker image]"
  }
}

"sticker code" is the sticker's unique identifier (it can be a word or a random set of characters). It acts as a text fallback in chat for players who do not have this mod or this specific sticker pack installed.

Example of a pack.json file:

{
  "name": "Cool Stickers",
  "stickers": {
    "happy": "happy.png",
    "cat": "animals/cat.png"
  }
}