DebugUtils

DebugUtils

Enables various debugging features of minecraft

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About this Mod

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🔎 Debug Utils

Mojang has various debugging tools implemented in minecraft that are removed for the release jar.
This mod adds them back which might be useful for various cases. You will need this mod on both the client and the server.

Debugging features include for example:

Entity Pathing: Showing a mobs pathfinding

Entity Brains: Showing the brain states of mobs

Entity Goals: Showing a mobs goal tasks

> 1.21.9

As of 1.21.9 the debugging features are no longer stripped for the release jar and can be accessed by the user. The process to do so though involves the use of jvm arguments meaning you cannot change it in game.
To accomodate that now this mod allows you to toggle the features in game without restarting it.

How to use

Use the command /debugutils <feature> <on | off> to turn a debugging feature on/off.

To turn all currently active features off use /debugutils off.

If you are on 1.21.9 the command has now been split between debugutils and debugutils_client.
debugutils_client toggles all features that do not require data from the server.

Available Versions

debugutils-26.1.2-1.0.9-fabric.jarrelease
MC 26.1.2fabric
May 11, 2026
debugutils-26.1.2-1.0.9-neoforge.jarrelease
MC 26.1.2neoforge
May 11, 2026
debugutils-1.21.11-1.0.9-neoforge.jarrelease
MC 1.21.11neoforge
December 28, 2025
debugutils-1.21.11-1.0.9-fabric.jarrelease
MC 1.21.11fabric
December 28, 2025
debugutils-1.21.9-1.0.9-neoforge.jarrelease
MC 1.21.9neoforge
October 2, 2025

How to Install DebugUtils on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (26.1.2).

3

Install Mod

Open the mod browser in the dashboard and search for "DebugUtils". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricforgeneoforge

Minecraft Versions

26.1.2, 1.21.11, 1.21.9 (+9 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

DebugUtils server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.1.2). You can switch loaders with one click in the panel.

Is DebugUtils compatible with fabric and forge and neoforge?

DebugUtils officially supports fabric, forge, neoforge for Minecraft 26.1.2, 1.21.11, 1.21.9. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with DebugUtils – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if DebugUtils consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install DebugUtils with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
GNU Lesser General Public License v3.0 only
Server-side
Required

Supported Versions

26.1.21.21.111.21.91.21.81.21.51.21.41.21.11.211.20.61.20.1+2 more