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A biome.json structure

Prerequisites

To understand whats following, ensure to have read the Content Pack Files Structure page.

The folder objects/biomes/ was designed to register all the new biomes you want for Minecraft

All fresh new json are JsonObject file, there always starts with {}

---

Understanding the json structure

Some Precisions

Creating biome are the most complicated thing.
It take so many parameters and the possibilities are so great,
That it's easy to get lost...
And you're probably going to take a long time before you get to a correct result.
Create biome at your own risk !

Take a look at Biomes examples

---

Biomes examples

Blueish forest type frozen biome

objects/biomes/test_biome.json

{
  "registryName": "test_biome",
  "category": "FOREST",
  "surface": {
    "surfaceBuilderType": "DEFAULT",
    "terrainConfig": {
      "topBlock": "minecraft:grass_block",
      "undergroundBlock": "minecraft:gravel",
      "underWaterBlock": "minecraft:sandstone"
    }
  },
  "climat": {
    "rainType": "SNOW",
    "temperature": 0.1,
    "downfall": 1
  },
  "biomeColor": {
    "waterColor": 4159204,
    "waterFogColor": 329011,
    "grassColor": 7512804,
    "foliageColor": 10400234
  },
  "biomeType": "WARM",
  "depth": 0.125,
  "scale": 0.05,
  "weight": 1000,
  "biomeDictionaryTypes": [
    "FOREST"
  ],
  "spawns": [
    {
      "entityClassification": "CREATURE",
      "entity": "minecraft:pig",
      "weight": 12,
      "minMaxGroupCount": 4
    }
  ],
  "carvers": [
    {
      "type": "AIR",
      "carver": "CAVE",
      "probability": 0.14285715
    },
    {
      "type": "AIR",
      "carver": "CANYON",
      "probability": 0.02
    }
  ],
  "structures": [
    {
      "name": "minecraft:mineshaft",
      "config": "MINESHAFT",
      "probability": 0.004,
      "mineshaftType": "NORMAL"
    },
    {
      "name": "minecraft:stronghold"
    },
    {
      "name": "minecraft:stronghold"
    },
    {
      "name": "minecraft:village",
      "config": "VILLAGE",
      "startPool": "minecraft:village/plains/town_centers",
      "size": 32
    }
  ],
  "features": [
    {
      "decoration": "TOP_LAYER_MODIFICATION",
      "feature": {
        "name": "freeze_top_layer"
      }
    },
    {
      "decoration": "VEGETAL_DECORATION",
      "feature": {
        "name": "minecraft:random_selector",
        "config": "MULTIPLE_RANDOM",
        "multipleRandomFeature": {
          "features": [
            {
              "name": "birch_tree"
            },
            {
              "name": "dark_oak_tree"
            }
          ],
          "featureProperties": {
            "name": "minecraft:normal_tree"
          }
        },
        "probabilities": [
          0.2,
          0.1
        ]
      },
      "placement": {
        "name": "minecraft:count_extra_heightmap",
        "config": "COUNT_EXTRA_HEIGHTMAP",
        "count": 10,
        "extraChance": 0.1,
        "extraCount": 1
      }
    }
  ]
}

In-game Render

Reddish desert type biome with monsters

objects/biomes/biome_with_monsters.json

{
  "registryName": "biome_with_monsters",
  "category": "DESERT",
  "surface": {
    "surfaceBuilderType": "DEFAULT",
    "terrainConfig": {
      "topBlock": "minecraft:red_sand",
      "undergroundBlock": "minecraft:red_sand",
      "underWaterBlock": "minecraft:bricks"
    }
  },
  "climat": {
    "rainType": "NONE",
    "temperature": 2,
    "downfall": 0
  },
  "biomeColor": {
    "waterColor": 4159204,
    "waterFogColor": 329011
  },
  "biomeType": "DESERT",
  "depth": 0.125,
  "scale": 0.05,
  "weight": 1000,
  "biomeDictionaryTypes": [
    "HOT",
    "DRY",
    "SANDY",
    "JUNGLE",
    "SWAMP"
  ],
  "spawns": [
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:spider",
      "weight": 100,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:creeper",
      "weight": 100,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:zombie",
      "weight": 100,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:zombie_villager",
      "weight": 10,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:husk",
      "weight": 100,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:stray",
      "weight": 100,
      "minMaxGroupCount": 4
    },
    {
      "entityClassification": "MONSTER",
      "entity": "minecraft:silverfish",
      "weight": 10,
      "minGroupCount": 1,
      "maxGroupCount": 4
    }
  ]
}

In-game Render