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Nether API

by jbredwards

Players who build End and Nether worlds can rely on Nether API, a Forge library for adding biomes, structures and ambience to those dimensions.

ForgeClient and serverCustom license1.12.2

What it does

Nether API unifies the End and Nether biome generators of several older mods under one system. Biomes it manages can be added to the End or the Nether, and the same approach works for any biome. The library also fixes respawn dimension logic and several other bugs, and it offers new settings for both dimensions.

Each biome can carry its own passive ambient sounds, a darkness sound, passive particles, a custom lava color, a fog color and a music type. Generation weight is adjustable through NetherAPIRegistryEvent, and ambience values can be set through BiomeAmbienceEvent. Nether API is a Forge library for 1.12.2 only, with a client and server environment and a custom license that is not open source. The project has public source code and an issue tracker, and one catalog mod requires it: End Expansion - The Lamented Islands.

Key features

  1. Custom biome ambience

    Biomes can play passive ambient sounds, a darkness sound and passive particles, all configurable per biome.

  2. Lava and fog colors

    A biome can define its own lava color and fog color, and both can also be set from events during generation.

  3. Adjustable generation weight

    The chance that a biome generates can be changed through a registry event, so pack authors can tune their own biome lists.

  4. Custom End and Nether content

    Biomes and structures can be added to the End and the Nether, and the library applies the same handling to any biome.

Compatibility

Latest build for each game version and loader.

1.12.21.5.2
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Required by 1 mod

End Expansion - The Lamented Islands1.12.2

Use cases

Adding End and Nether biomes

Mod authors register new biomes for either dimension and attach ambience, lava color and fog color to each one.

Adding structures

Custom End and Nether structures can be placed through the library's generation system.

Who it’s for: Mod developers building End or Nether biomes and structures for Forge 1.12.2, and modpack makers who want ambience and biome settings in those dimensions.

Questions

Which Forge version does Nether API support?

Nether API has files for Forge 1.12.2 only, and its latest file, 1.5.2, was published on 2026-10-13.

Does End Expansion - The Lamented Islands need Nether API?

Yes. End Expansion - The Lamented Islands is listed as a mod that requires Nether API, so the library must be installed with it.

Must Nether API be installed on the server?

Yes. A server running it needs every connecting player to have it too.

Can Nether API be used in other dimensions?

The author text says biome ambience and generation handling apply to any biome, but biome generation support is described for the End and Nether.

In the catalog

Nether API is one of 3,514 Library mods on ModsFinder, and one of 1,576 Library mods for Forge. 2,920 mods support Minecraft 1.12.2.

Library mods3,514Forge modsMods for 1.12.22,920

More from jbredwards

All projects
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Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3Konkrete1.12 – 26.3CreativeCore1.12.2 – 26.3Bookshelf1.7.10 – 26.3MaLiLib1.12 – 26.3

What the author says

Also unifies different older mods' End and Nether biome generators under one system, fixes respawn dimension logic and other bugs, and offers new settings for the End and Nether. Ability to add custom End and Nether biomes!
jbredwards, on the Modrinth page

Official listing

Owner
jbredwards
Published
2023-06-13
Updated on Modrinth
2026-10-13
Facts verified
2026-10-15

Tags

LibraryWorld generationDecorationUtility
Open on ModrinthCompare