pumpkin-java-multiversion/assets/datapacks/26_3/data/minecraft/recipe/ladder.json

{
  "type": "minecraft:crafting_shaped",
  "key": {
    "#": "minecraft:stick"
  },
  "pattern": [
    "# #",
    "###",
    "# #"
  ],
  "result": {
    "count": 3,
    "id": "minecraft:ladder"
  }
}