WorldGen Editor

WorldGen Editor is a Minecraft world generation mod for creating island worlds from a simple JSON config.

It is made for players and modpack developers who want configurable archipelago-style worlds without rebuilding a full custom datapack by hand.

What It Does

• Adds a datapack-style island world preset.
• Different forms of generation: island, archipelago, ocean.
• Supports normal islands, ocean-carved straits/bays, and generated archipelagos.
• Supports custom position, radius, stretch, rotation, base shape, coastline roughness, temperature and noise settings.
• Supports per-entry biome exclusions and climate-aware ocean variants.
• Keeps terrain generation soft, so islands still use vanilla-style terrain instead of flat forced shapes.
• Includes a separate developer previewer for checking island layouts before generating a Minecraft world.

Main Config

The main file is:

config/worldgen_editor/continents.json

Basic example:

{
  "enabled": true,
  "outer_ocean": "minecraft:deep_ocean",
  "entries": [
    {
      "type": "island",
      "name": "Spawn Island",
      "x": 0,
      "z": 0,
      "radius": 120,
      "roughness": 0.4,
      "noise": {
        "seed": "spawn",
        "scale": 3.5
      }
    }
  ]
}

in previewer:

in game:

For a full explanation of all fields, see JSON_GUIDE.md in the GitHub repository.

How To Use

1. Install the correct mod jar for your loader.
2. Start Minecraft once so the config can be created.
3. Edit config/worldgen_editor/continents.json.
4. Create a new world and select in world type:

WorldGen Editor: Islands

If you edit the config while a world is already open, run:

/worldgen_editor reload

Reload affects only newly generated chunks. Existing chunks are not rebuilt.

Previewer

WorldGen Editor also has a separate previewer tool for development. It helps tune island positions, sizes, coastlines, and roughness before opening Minecraft and generating a new test world.

WorldGen Editor preview github

Commands

/worldgen_editor enable
/worldgen_editor disable
/worldgen_editor status
/worldgen_editor reload

Notes

• The mod is intended for new worlds.
• Existing chunks are not automatically regenerated.
• For clean results after major config changes, create a new world or delete the affected region files carefully.
• The previewer is a helper tool for developers and modpack makers. It is not required to play with the mod and do not visualize all picture of world gen.

Links

• Mod github: waterflane/WorldGen-Editor
• Previewer github: waterflane/WorldGen-Editor-Preview
• License: Creative Commons BY-NC-SA 4.0