minecraft-assets/data/minecraft/recipe/pumpkin_seeds.json

{
  "type": "minecraft:crafting_shapeless",
  "category": "misc",
  "ingredients": [
    {
      "item": "minecraft:pumpkin"
    }
  ],
  "result": {
    "count": 4,
    "id": "minecraft:pumpkin_seeds"
  }
}