WorldGen Editor

WorldGen Editor lets a world generate from a JSON preset, in the spirit of a datapack. Vanilla noise still forms the base, and the Overworld is routed through island-aware biome and density logic. Three world types ship with the mod, including Small Island, and the preset can choose island, ocean and archipelago entry types. A full explanation of the preset fields is in the wiki, and the source code is public on GitHub.

A world created with the WGE world type keeps that type as its main source of truth. The config can be edited while a world is open and then reloaded, but the change applies only to terrain generated after the reload, and chunks already in the world keep their shape. A status view shows the effective state: the global config flag, the per-world flag, the selected world type, the active preset, its entry count, and the config and world-state paths. If the preset changes, the config falls back to a preset.

The mod is server-side only, so the server runs it and players join without installing anything. Final terrain still follows the selected seed and the active world on top of vanilla generation. Files are published for Fabric, Forge and NeoForge for 1.21.1, and the license is Creative Commons Attribution Non Commercial Share Alike 4.0, which is not open source.