
No Duping
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
I don't know my version or loader

This data pack aims to disable the following duplication glitches: rails; carpets; string; tnt; gravity blocks; tripwire hooks. It does this by deleting the duplicated item or entity after it has been created in the general set-ups.
Notes: dupes are enabled by default, so disable them in the settings.
Hide the “world warning” when enabling this datapack Setup / settings (1.21.6+) for server owners or single players The configuration is now handled through an in-game dialog menu.
You can open it in either of these ways:
/trigger no_dupe_tutorial From the pause menu (in-game) The current settings can still be viewed with:
/trigger no_dupe_tell_settings Older versions (previous setup via commands) notice If you want to support small creators like me, you can turn off ad blocker. Check out my profile for more creations: https://modrinth.com/user/ThatCandle03803 Keep in mind:
Ensure you're familiar with installing data packs. Verify compatibility with your Minecraft version. Terms of use:
Do:
Use and modify the data pack for private use. Credit me (thatcandle03803) as the creator when using the data pack in public, such as in video showcases, or when editing and redistributing the original material. Don't:
Redistribute the data pack for commercial purposes. Under CC-BY-NC-SA 4.0 license
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.6, 1.21.7, 1.21.8
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as no-dupeing-2.0.jar — drop this file into the mods folder
- Download size: 516 KB
- Download link checked 3 Oct 2026 — working
These come from our own check of the pack file, not from the source page.