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

{
  "type": "minecraft:crafting_shaped",
  "group": "wooden_fence_gate",
  "pattern": [
    "#W#",
    "#W#"
  ],
  "key": {
    "#": {
      "item": "minecraft:stick"
    },
    "W": {
      "item": "minecraft:birch_planks"
    }
  },
  "result": {
    "item": "minecraft:birch_fence_gate"
  }
}