
Modrinth · Minecraft mod
Monument Data Fix
API support for custom data fixers!
Quick answer
Which Monument Data Fix release matches Fabric?
Monument Data Fix 1.0.0 targets 1.21, 1.21.1, 1.21.2 with Fabric. Do not install it on the client. It must be installed on the dedicated server. No extra mods listed for this file.
Where it goes
Is Monument Data Fix required on the client, server, or both?
Do not install it on the client. It must be installed on the dedicated server.
This file is marked server-only.
What else does Monument Data Fix 1.0.0 need?
1.0.0 on Fabric. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Monument Data Fix without breaking your instance.
Built for Monument Data Fix 1.0.0 on Fabric. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.0.0. It targets 1.21, 1.21.1, 1.21.2 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
Do not install it on the client. It must be installed on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.0.0. It opens that exact file at the source.
About this project
What does Monument Data Fix add?
Monument Data Fix
A library that enables modders to register customized data fixers.
What is Data Fixer?
As Mojang said in the readme file, DataFixerUpper is "a set of utilities designed for incremental building, merging, and optimization of data transformations". It is created for converting the game data between different versions of the game.
What does Monument Data Fix do?
Monument Data Fix provides a set of APIs for modders to create customized data fixers. The mod by default provides data fixers for Sweet Potato Reborn and Xdi8Aho Mod, which allows you to upgrade a save in Minecraft 1.16-1.19 with Sweet Potato Mod to Minecraft 1.21+ with Sweet Potato Reborn, or upgrade a save in Minecraft 1.18.2 with Xdi8Aho Mod to Minecraft 1.21.4+ with Xdi8Aho Mod and Sweet Potato Reborn.
Note: In Minecraft 1.18.2, Xdi8Aho Mod was a combination of Sweet Potato Mod and the own content of Xdi8Aho Mod. However, Xdi8Aho Mod has already been separated into the two mods, and now Xdi8Aho Mod only contains the content of its own. Therefore, you need to install Xdi8Aho Mod and Sweet Potato Reborn at the same time in Minecraft 1.21.4+. Otherwise, the game would delete the old blocks which it could not recognize.
Do I need this mod?
For general players: If you don't need to upgrade a modded save, you don't need Monument Data Fix. If you have a modded save to upgrade, and the mod developer states that Monument Data Fix is needed as a dependency, you should install this mod.
For mod developers: If you would like to enable your mod saves to be upgraded, make a data fixer mod using Monument Data Fix as a dependency and point out "Monument Data Fix is needed when upgrading saves" in the mod description.
Currently, there isn't a program document for the mod. In order to add your custom data fixers, call top.qwerty770.monument.datafix.api.DataFixerRegistry$addDataFix(String name, CustomDataFixer dataFixer) or top.qwerty770.monument.datafix.api.DataFixerRegistry$addDataFix(String name, Function<DataFixerBuilder, DataFix> dataFixer) before net.minecraft.util.datafix.DataFixers$addFixers is called. If you have questions on the registry, refer to Monument Data Fix itself as an example, because it provides data fixers for two mods by default. You may submit issues on Github.
External Links
Project description from Modrinth.
Pick your setup
Monument Data Fix by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.4
2 loader builds1.21.3
2 loader builds1.21.2
2 loader builds1.21.1
2 loader builds1.21
2 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Monument Data Fix versions and loaders
1.0.0
monument-data-fix-fabric-1.0.0.jar
12 Jun 2025
Looking for an older file? The official Modrinth project page is in Resources.