CaveBiomesAPI
!!! It is a library mod! By defaultmeans byte-for-byte vanilla behavior. Everything is opt-in. !!!
CaveBiomesAPI is a core/library mod for Minecraft 1.12.2 designed specifically for mod developers. It significantly expands the vanilla world generation capabilities by introducing vertical (3D) biomes and custom world height limits.
If you've ever wanted to create massive underground ecosystems with different biomes stacked beneath the surface, or high mountains scrapping the sky, this API is for you!
Features
- Vertical Biomes (3D Biomes): Allows developers to generate completely different biomes at varying Y-levels (heights) in the same column. You can easily stack different biomes one under another (e.g., a lush surface biome with a glowing mushroom cave biome directly underneath).
- World Height Configuration: Gives modders the ability to easily configure and extend the world height limits in 1.12.2.
- Developer-Friendly: Provides a clean and accessible API to integrate complex underground world generation into your own mods.
Requirements
- Minecraft 1.12.2 / Forge 14.23.5.2864
- MixinBootstrap (runtime dependency)
For Developers
- Check the GitHub repo for API documentation and examples
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.12.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as cavebiomesapi-1.1.2.jar — drop this file into the mods folder
- Download size: 193 KB
- Download link checked 23 Aug 2026 — working
These come from our own check of the pack file, not from the source page.