Suggestions appear as you type. Use the up and down arrows to choose one and Enter to open it.

This page's audience real numbers from our own analytics — open to see them
–Visitors
–Page views
–Clicks to vendors
–Time on page
–Reading now
Clicks to vendors, by tool
  • –
Top countries
  • –
Devices
  • –

– · counted by iTechGuides's own first-party analytics, bots removed, every figure rounded down · how we count

Custom World Generation review

Free#18 of 31 in Minecraft World Generation Mods

A free, open-source mod for JSON-configured overworld generation on Forge or NeoForge.

7.1/10Editor score
Visit site
Custom World Generation7.1 Visit site

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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.

Custom World Generation pros and cons

  • 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

Custom World Generation fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. How we rank.

Last updated · How we research and update