spawner.json

[
  {
    "mob": "minecraft:zombie",
    "persecond": 1.0,
    "attempts": 5,
    "amount": {
      "minimum": 2,
      "maximum": 5
    },
    "conditions": {
      "dimension": "minecraft:overworld",
      "norestrictions": true,
      "mindist": 10,
      "maxdist": 60,
      "maxthis": 20
    }
  }
]