Mixin Helper
Mixin Helper gives modpack developers control over which mixins load, in what order, and which injected methods are removed, through a single JSON config file.
What it does
Mixin Helper lets a developer blacklist whole mixin configs or individual mixins that target a given class, change the priority that resolves load-order conflicts between mods, and neutralize one injected method without disabling the rest of its mixin. Changes are made in one JSON file, with no code recompiling and no removal of mods. Its audit report writes a detailed JSON listing of each loaded mixin config, including annotations, to help diagnose conflicts quickly.
The tool is aimed at modpack developers and advanced users who need finer control than a mod's default mixins allow. Because it changes how patches are applied, incorrect use can break things, and the author notes warn to back up worlds before making changes, since disabled mixins can affect world data and make save files incompatible. Mixin Helper runs on Fabric, Forge and NeoForge, and it is open source under the GNU General Public License v3.0 only. Its files cover 1.20.1 and 1.21.1.
Key features
Mixin blacklisting
Whole mixin configs or only the mixins aimed at a specific class can be disabled from the JSON file.
Priority control
The execution order of mixins can be overridden to settle load-order conflicts between mods.
Method removal
A single injected method can be neutralized while the rest of its mixin keeps working.
Audit report
A generated JSON report lists each loaded mixin config with its annotations, to speed up finding conflicts.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
PICO Helper is a Fabric-only client-side mod for 1.21.4, released under All rights reserved and not open source. Server Helper is server-side only, runs on Fabric, NeoForge and Quilt for 1.21.8, and is open source under the MIT License. Mixin Helper covers both loaders and sides differently: it works on Fabric, Forge and NeoForge for 1.20.1 and 1.21.1, and it changes mixin loading rather than HUD or server behavior.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mixin Helper | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Not published | 2026-06-12 |
| PICO Helper | Fabric | 1.21.4 | Client-side only | 2026-06-13 |
| Server Helper | Fabric, NeoForge and Quilt | 1.21.8 | Server-side only | 2025-09-29 |
Questions
Which loaders does Mixin Helper support?
Does Mixin Helper need to be installed on a server?
Can Mixin Helper break a world?
In the catalog
Mixin Helper is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from TysonTheEmber
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What the author says
Take control of mixin conflicts in your modpack. Mixin Helper lets you blacklist, prioritize, and surgically modify mixins from any loaded mod, all from a single JSON config file. No code, no recompiling, no removing mods. This is an advanced tool. If you don't know what mixins are or how they work, this mod is not…
Official listing
- Modrinth page
- modrinth.com/mod/mixin-helper
- Owner
- TysonTheEmber
- Published
- 2026-03-22
- Updated on Modrinth
- 2026-06-12
- Facts verified
- 2026-10-15