MineAssets/1.12.2/assets/minecraft/recipes/melon_seeds.json

{
  "type": "crafting_shaped",
  "pattern": [
    "M"
  ],
  "key": {
    "M": {
      "item": "minecraft:melon"
    }
  },
  "result": {
    "item": "minecraft:melon_seeds"
  }
}