Datamancer
by Trivaxy
Datamancer is a Fabric and Quilt library for datapack and command block developers, with tools that speed up building and testing functions.
What it does
The mod gives datapack developers and command block builders a set of utilities for writing functions. Function profiling measures how long a function takes to run, so slow commands can be found and tuned. Automatic datapack reloading picks up file changes without a manual reload, which shortens the edit and test cycle.
Debug lines draw the path of a function in the world, and marker goggles show marker entities with their data. A live variable tracker displays the values of selected variables while a function runs. Fabric API is a required dependency and must be installed alongside Datamancer. Installation covers the server and each player's game.
Builds are published for Fabric and Quilt across five release versions 1.20 – 1.21, with 1.2.1 for 1.21 as the latest file, released on 2024-08-03. Snapshot builds are published as well. The code is released under the MIT License and is open source.
Key features
Function profiling
Profiling and benchmarking report how long functions take, helping developers find costly commands.
Debug lines
Debug lines draw function paths in the world, a direct way to inspect what a function does.
Marker goggles
Goggles reveal marker entities and their data, making hidden markers easier to locate and check.
Live variable tracking
A tracker shows variable values as they change, so developers can watch state during a run.
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Datapack developers and command block enthusiasts who write functions and want quicker feedback while building. Players who only use finished datapacks have no need for the mod.
How it compares
libMCdev is also a Fabric and Quilt mod, licensed under the Apache License 2.0 and open source, but it targets 1.20.2 – 1.20.4 and runs on client and server. F3 Commands is client-side only, open source under the MIT License and published for 1.19.4 on Fabric and Quilt. Datapack Commands is server-side only, open source under the GNU General Public License v3.0 only, and supports Fabric, NeoForge and Quilt for 1.20.5 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Datamancer | Fabric and Quilt | 1.20 – 1.21 | Client and server | 2024-08-03 |
| libMCdev | Fabric and Quilt | 1.20.2 – 1.20.4 | Client and server | 2024-04-07 |
| F3 Commands | Fabric and Quilt | 1.19.4 | Client-side only | 2023-06-28 |
| Datapack Commands | Fabric, NeoForge and Quilt | 1.20.5 – 26.3 | Server-side only | 2026-09-16 |
Questions
Does Datamancer need Fabric API?
Does the server need Datamancer?
Which game versions does Datamancer support?
In the catalog
Datamancer is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 15,770 mods support Minecraft 1.21.
More from Trivaxy
Similar mods
What the author says
Getting started is simple! Just install the mod and then head over to the wiki page to get going.
Official listing
- Modrinth page
- modrinth.com/mod/datamancer
- Owner
- Trivaxy
- Published
- 2023-09-13
- Updated on Modrinth
- 2024-08-03
- Facts verified
- 2026-10-15