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

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "key": {
    "#": {
      "item": "minecraft:nether_brick"
    },
    "W": {
      "item": "minecraft:nether_bricks"
    }
  },
  "pattern": [
    "W#W",
    "W#W"
  ],
  "result": {
    "count": 6,
    "item": "minecraft:nether_brick_fence"
  }
}