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

{
  "type": "minecraft:crafting_shaped",
  "category": "equipment",
  "key": {
    "#": "minecraft:stick",
    "X": "#minecraft:diamond_tool_materials"
  },
  "pattern": [
    "X",
    "#",
    "#"
  ],
  "result": {
    "count": 1,
    "id": "minecraft:diamond_shovel"
  }
}