Elysium API
Elysium API is a library for developers and modpack creators, covering vanilla behavior that is hard to change without invasive workarounds.
What it does
The library reaches into the areas of Minecraft that are rarely exposed, where changing vanilla behavior normally requires fragile workarounds. It groups several Java APIs, utility classes and methods, and data-driven and resource-driven systems that a mod or a pack can call instead of patching the game directly.
Elysium API is published for Forge and NeoForge, with files for 1.20.1 and 1.21.1. Only the client or the server needs it, and neither side is required to run it. One other catalog mod, Jaden's Nether Expansion, requires it, so installing Elysium API is necessary for that mod to start. The code is open source under the GNU General Public License v2.0 only.
Key features
Java utility APIs
Several Java APIs are bundled, giving mod code shared helpers rather than duplicated logic.
Utility classes and methods
Reusable classes and methods are provided for common tasks in mod code.
Data-driven systems
Behavior can be declared in data files, so content authors can change parts of a mod without writing Java.
Resource-driven systems
Resource files drive additional systems, letting packs adjust features through assets.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 1 mod
Use cases
Mod development
Developers call the shared APIs and utilities instead of writing their own versions of the same helpers.
Modpack building
Pack creators use the data-driven and resource-driven systems to adjust behavior that vanilla keeps fixed.
Who it’s for: Mod developers who want shared helpers for hardcoded parts of the game, and modpack creators who need to change behavior through data and resources.
How it compares
Simply Tooltips works on the client alone, covers Fabric, Forge and NeoForge for 1.20.1 – 1.21.1, and is not open source under a custom license. Platform works on either side, and neither needs it; it covers Fabric, Forge, NeoForge and Quilt for 1.16.5 – 1.21.1, and is open source under the GNU Lesser General Public License v3.0 only. Elysium API covers only Forge and NeoForge, for 1.20.1 and 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Elysium API | Forge and NeoForge | 1.20.1 – 1.21.1 | Client or server, optional | 2026-08-22 |
| Simply Tooltips | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client-side only | 2026-08-23 |
| Platform | Fabric, Forge, NeoForge and Quilt | 1.16.5 – 1.21.1 | Client or server, optional | 2026-06-08 |
Questions
Which loaders does Elysium API support?
Does Jaden's Nether Expansion need Elysium API?
Can Elysium API be used on a server?
In the catalog
Elysium API is one of 3,514 Library mods on ModsFinder, and one of 1,576 Library mods for Forge. 32,366 mods support Minecraft 1.21.1.
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What the author says
Elysium-API is a library mod for Minecraft NeoForge 1.21.1. It provides a robust collection of utilities, built-in features, and data-driven systems designed to simplify and expand the modification capabilities for both mod developers and modpack creators. Elysium's target is to make the game easier to modify by…
Official listing
- Modrinth page
- modrinth.com/mod/elysium-api
- Owner
- ThatJadenXgamer
- Published
- 2024-12-12
- Updated on Modrinth
- 2026-08-22
- Facts verified
- 2026-10-15