Custom World Generation
Custom World Generation: A free, open-source mod for JSON-configured overworld generation on Forge or NeoForge. Ranked #18 of 31 in Minecraft World Generation Mods by our editors (7.1/10); pricing: Free plan; best for players who want JSON-based generation configuration.
At a glance
- Editor score7.1 / 10
- PricingFree plan
- Best forPlayers who want JSON-based generation configuration
- Free planYes
- Paid fromNone
- World coverageOverworld
- Facts checked11 Oct 2026
Where it wins
- Configure terrain, biome, and structure generation in a JSON file
- Example presets and a readme guide support configuration
- Free and open source, with optional client-side installation
Where it doesn't
- Requires installation on the server
- Supports only Forge and NeoForge
- Limited to listed Minecraft versions and overworld generation
Our verdict on Custom World Generation
Custom World Generation is a free Minecraft Java Edition mod for players who want to adjust terrain, biome, and structure generation through JSON configuration. It is aimed at solo players and small groups managing a world, rather than players looking for a graphical world-building interface or a hosted service. The mod can be installed on the server; client-side installation is optional and has no effect. It is a focused generation tool, not a general-purpose dimension or biome expansion mod.
Configuration lives in a JSON file in the game or server configuration folder. A readme guide and example presets give users a starting point for editing generation settings. This approach offers direct control through configuration files, but it assumes the user is comfortable locating and changing those files. Players who prefer in-game controls or want to avoid server-side setup may find the workflow less suitable. The mod is open source and free, so its appeal is strongest for players who want a configurable, self-hosted option without a listed paid tier.
Compatibility is limited to Forge and NeoForge and the listed Minecraft releases: 1.21, 1.20–1.20.2, 1.19.3–1.19.4, and 1.18.2. Its stated coverage is the overworld; it does not provide dimension generation or biome additions. Choose it if JSON-based adjustment of overworld terrain, biome, and structure generation fits your setup. Players on other loaders or versions, or those seeking new dimensions or added biomes, should look for another mod. The project is separate from the Ocean World mod.
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Custom World Generation pricing
Custom World Generation fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Minecraft versions | 1.21, 1.20–1.20.2, 1.19.3–1.19.4, 1.18.2 |
| Mod loaders | Forge, NeoForge |
| World coverage | Overworld |
| Adds biomes | No |
| Terrain customization | Yes |
| Dimension generation | No |
| Deployment | Self-hosted |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | modrinth.com |
| Facts checked | 11 Oct 2026 |
Alternatives to Custom World Generation
- TerralithA free Overworld overhaul with more than 95 biomes, custom caves and structures.8.9
- TectonicA free terrain-focused project for players who want larger landforms and varied seas.8.8
- LithosphereA free Overworld generator for players who want continents, rivers, varied terrain and reworked caves.8.7
See all Custom World Generation alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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