toka_spawn_rules_testmob.json

{
  "format_version": "1.8.0",
  "minecraft:spawn_rules": {
    "description": {
      "identifier": "toka7290:testmob",
      "population_control": "animal"
    },
    "conditions": [
      {
        "minecraft:spawns_on_surface": {},
        "minecraft:spawns_on_block_filter": "minecraft:grass",
        "minecraft:density_limit": {
          "surface": 25,
          "underground": 20
        },
        "minecraft:weight": {
          "default": 10
        },
        "minecraft:biome_filter": {
          "test": "has_biome_tag",
          "operator": "==",
          "value": "overworld"
        }
      }
    ]
  }
}