satisfactory/data/recipes/machine/production/smelter.json

{
  "type": [
    "machine"
  ],
  "machine": "_craft_bench",
  "size": [ 6, 10, 10 ],
  "power_usage": 4,
  "recipes": [
    {
      "input": {
        "iron_rod": 5,
        "wire": 8
      },
      "output": {
        "smelter": 1
      }
    }
  ]
}