minecraft-assets/data/minecraft/recipes/armor_stand.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "///",
    " / ",
    "/_/"
  ],
  "key": {
    "/": {
      "item": "minecraft:stick"
    },
    "_": {
      "item": "minecraft:smooth_stone_slab"
    }
  },
  "result": {
    "item": "minecraft:armor_stand"
  }
}