WorldGen Editor
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A Minecraft mod that allows you to control world generation directly in the game via a JSON file!
Forge is a popular mod loader for versions 1.1+ of Minecraft.
Neoforge is a fork of the Minecraft Forge available for versions 1.20.1+ of Minecraft. Many Forge mods are compatible with Neoforge and vice versa.
Fabric is a mod loader for versions 1.14+ of Minecraft, particularly popular for client side and optimization mods.
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Description
WorldGen Editor
WorldGen Editor is a Minecraft world generation mod for creating island worlds from simple JSON preset files.
It is made for players, server owners, and modpack developers who want configurable archipelago-style worlds without rebuilding a full custom datapack by hand. The mod keeps Minecraft's normal noise generation as the base, then routes the Overworld through island-aware biome and density logic.
What It Does
- Adds datapack-style world presets for island generation.
- Adds three bundled world types:
WGE: IslandsWGE: ArchipelagoWGE: Small Island
- Adds configurable preset files in
config/worldgen_editor/presets/. - Adds a main config file:
config/worldgen_editor/worldgen_editor.json. - Supports
island,ocean, andarchipelagoentry types. - Supports normal islands, ocean-carved straits/bays, and generated archipelago clusters.
- Supports custom position, radius, stretch, rotation, base shape, coastline roughness, temperature, biome patch size, and noise settings.
- Supports per-entry biome exclusions using exact biome ids and biome tags.
- Supports climate-aware land and ocean fallback biome selection.
- Supports configurable outer ocean biome, defaulting to
minecraft:deep_ocean. - Keeps terrain generation soft, so islands still use vanilla-style terrain instead of flat forced shapes.
- Keeps caves, ores, structures, vanilla surface logic, and terrain features as close to normal Minecraft generation as possible.
- Includes a separate developer previewer for checking island layouts before generating a Minecraft world.
Main Config
The main file is:
config/worldgen_editor/worldgen_editor.json{
"enabled": true,
"active_preset": "archipelago"
}Preset files are stored here:
config/worldgen_editor/presets/default.json
config/worldgen_editor/presets/archipelago.json
config/worldgen_editor/presets/small_island.jsonThe bundled presets are:
default: a mixed example with a spawn island, an ocean cut, a larger island, and a warm archipelago.archipelago: a spawn archipelago with many smaller islands plus extra islands around it.small_island: one compact island for simple survival starts or testing.
Preset priority is:
world type preset > config active_preset > legacy continents.jsonThat means a world created with WGE: Archipelago uses presets/archipelago.json, even if the global config fallback says "active_preset": "default".
Basic example:
in previewer: 
in game: 
For a full explanation of all fields, see wiki in the GitHub.
How To Use
- Install the correct mod jar for your loader.
- Start Minecraft once so the config files can be created.
- Edit one of the files in
config/worldgen_editor/presets/. - Create a new world and select WGE world types, where you edited:
WGE: Islands
WGE: Archipelago
WGE: Small IslandIf you edit the config while a world is already open, run:
/worldgen_editor reloadReload 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, roughness, ocean cuts, and archipelago layouts before opening Minecraft and generating a new test world.
WorldGen Editor preview github
The previewer is intended as a helper for planning layouts. Minecraft's final terrain still depends on vanilla world generation, the selected seed, and the active world preset.
Commands
/worldgen_editor enable
/worldgen_editor disable
/worldgen_editor status
/worldgen_editor preset <name>
/worldgen_editor reloadstatus shows the effective state, global config flag, per-world flag, selected world type preset, active preset, entry count, active config path, and world-state path.
preset <name> changes the config fallback preset. If the world was created with a WGE world type, that world type remains the main source of truth for newly generated chunks.
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.
continents.jsonis only a legacy fallback for old configs. New configs useworldgen_editor.jsonandpresets/*.json.- The previewer is a helper tool for developers and modpack makers. It is not required to play with the mod and does not simulate every part of Minecraft world generation.
Links
- Mod github: waterflane/WorldGen-Editor
- Previewer github: waterflane/WorldGen-Editor-Preview
- License: Creative Commons BY-NC-SA 4.0
WorldGen Editor
WorldGen Editor is a Minecraft world generation mod for creating island worlds from simple JSON preset files.
It is made for players, server owners, and modpack developers who want configurable archipelago-style worlds without rebuilding a full custom datapack by hand. The mod keeps Minecraft's normal noise generation as the base, then routes the Overworld through island-aware biome and density logic.
What It Does
- Adds datapack-style world presets for island generation.
- Adds three bundled world types:
WGE: IslandsWGE: ArchipelagoWGE: Small Island
- Adds configurable preset files in
config/worldgen_editor/presets/. - Adds a main config file:
config/worldgen_editor/worldgen_editor.json. - Supports
island,ocean, andarchipelagoentry types. - Supports normal islands, ocean-carved straits/bays, and generated archipelago clusters.
- Supports custom position, radius, stretch, rotation, base shape, coastline roughness, temperature, biome patch size, and noise settings.
- Supports per-entry biome exclusions using exact biome ids and biome tags.
- Supports climate-aware land and ocean fallback biome selection.
- Supports configurable outer ocean biome, defaulting to
minecraft:deep_ocean. - Keeps terrain generation soft, so islands still use vanilla-style terrain instead of flat forced shapes.
- Keeps caves, ores, structures, vanilla surface logic, and terrain features as close to normal Minecraft generation as possible.
- Includes a separate developer previewer for checking island layouts before generating a Minecraft world.
Main Config
The main file is:
config/worldgen_editor/worldgen_editor.json
{
"enabled": true,
"active_preset": "archipelago"
}
Preset files are stored here:
config/worldgen_editor/presets/default.json
config/worldgen_editor/presets/archipelago.json
config/worldgen_editor/presets/small_island.json
The bundled presets are:
default: a mixed example with a spawn island, an ocean cut, a larger island, and a warm archipelago.archipelago: a spawn archipelago with many smaller islands plus extra islands around it.small_island: one compact island for simple survival starts or testing.
Preset priority is:
world type preset > config active_preset > legacy continents.json
That means a world created with WGE: Archipelago uses presets/archipelago.json, even if the global config fallback says "active_preset": "default".
Basic example:
in previewer:
in game:
For a full explanation of all fields, see wiki in the GitHub.
How To Use
- Install the correct mod jar for your loader.
- Start Minecraft once so the config files can be created.
- Edit one of the files in
config/worldgen_editor/presets/. - Create a new world and select WGE world types, where you edited:
WGE: Islands
WGE: Archipelago
WGE: Small Island
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, roughness, ocean cuts, and archipelago layouts before opening Minecraft and generating a new test world.
WorldGen Editor preview github
The previewer is intended as a helper for planning layouts. Minecraft's final terrain still depends on vanilla world generation, the selected seed, and the active world preset.
Commands
/worldgen_editor enable
/worldgen_editor disable
/worldgen_editor status
/worldgen_editor preset <name>
/worldgen_editor reload
status shows the effective state, global config flag, per-world flag, selected world type preset, active preset, entry count, active config path, and world-state path.
preset <name> changes the config fallback preset. If the world was created with a WGE world type, that world type remains the main source of truth for newly generated chunks.
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.
continents.jsonis only a legacy fallback for old configs. New configs useworldgen_editor.jsonandpresets/*.json.- The previewer is a helper tool for developers and modpack makers. It is not required to play with the mod and does not simulate every part of Minecraft world generation.
Links
- Mod github: waterflane/WorldGen-Editor
- Previewer github: waterflane/WorldGen-Editor-Preview
- License: Creative Commons BY-NC-SA 4.0
Screenshots
Gallery
-
preview view -
In-game view An image of how generation change looks in-game -
Preview tool view A tool that allows you to easily edit JSON with a preview of the approximate shape of the island! Tool github: https://github.com/waterflane/WorldGen-Editor-Preview
-
Preview tool view A tool that allows you to easily edit JSON with a preview of the approximate shape of the island! Tool github: https://github.com/waterflane/WorldGen-Editor-Preview -
In-game view An image of how generation change looks in-game -
some islands in preview
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