No Duping
No Duping is a data pack that targets item duplication glitches, and its switches can be toggled in game through a dialog menu.
What it does
The pack includes a set of toggles that disable duplication rails, gravity blocks and tripwire hooks, the setups most often used to copy items. Duplicated item entities can be deleted after the set-ups are created, and duplication is enabled by default until a server owner changes the settings. Configuration is handled through an in-game dialog menu, and the warning shown on world load can be hidden for single players and server owners who prefer it.
Because the work is done by a data pack, the mod is installed into a world's datapacks folder rather than added as a loader mod. Installation requires familiarity with installing data packs. Files are published for Fabric, Forge, NeoForge and Quilt across six release versions, 1.21.6 – 1.21.11, and each loader's latest file targets 1.21.11. Only a server must run the pack, while players may leave it out. The mod is not open source; it is licensed under the Creative Commons Attribution Non Commercial Share Alike 4.0 license, which allows redistribution of the data pack but not commercial use.
Key features
Duplication rail toggles
Switches disable the rail setups used to copy items, and each one can be changed on its own.
Gravity block and tripwire hook checks
Gravity blocks and tripwire hooks, both common in duplication builds, can be disabled by the server.
Duplicate entity removal
Duplicated item entities can be deleted after the set-ups they came from have been created.
In-game configuration menu
Settings are changed through a dialog menu inside the game, without editing files by hand.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who want to limit item duplication through a data pack, and players of single-player worlds who want the same switches locally. Familiarity with installing data packs is expected.
How it compares
Panda Anti-Dupe is a Fabric server-side mod under the CC0 1.0 Universal license and open source, published for 1.21.1 – 26.3. Carpet EDTP Addition is server-side only and open source under the GNU General Public License v3.0 or later, with Fabric and Quilt files for 1.21.10 – 26.2. No Duping differs in form: it is a data pack rather than a loader mod, and it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| No Duping | Fabric, Forge, NeoForge and Quilt | 1.21.6 – 1.21.11 | Server required, client optional | 2026-06-28 |
| Panda Anti-Dupe | Fabric | 1.21.1 – 26.3 | Server-side only | 2026-10-04 |
| Carpet EDTP Addition | Fabric and Quilt | 1.21.10 – 26.2 | Server-side only | 2026-09-05 |
Questions
Does No Duping need a mod loader?
Does a server need No Duping installed?
Which game versions does No Duping support?
In the catalog
No Duping is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
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.
Official listing
- Modrinth page
- modrinth.com/mod/no-dupeing
- Owner
- ThatCandle03803
- Published
- 2026-06-26
- Updated on Modrinth
- 2026-06-28
- Facts verified
- 2026-10-15