String Duper

Adds back the functionallity of string duping which mojang removed in older updates.

4.2K Downloads

fabriceconomygame-mechanicsutility

Rent Server with this Mod

About this Mod

String Duper

This mod is pretty simple. All it does is restore back string duping.
You can toggle it on and off in modmenus settings if installed and it will by default be turned on. I hope you guys like this mod I was originally going to make it after the update that removed string duping but I forgot. :)

Available Versions

String Duper 0.1.6release

MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric

January 26, 2026

String Duper 0.1.5release

MC 1.21.11fabric

January 26, 2026

How to Install String Duper on Your Server

Order Server

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

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

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

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+9 more)

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

String Duper 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 (1.21.11). You can switch loaders with one click in the panel.

Is String Duper compatible with fabric?

String Duper officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with String Duper – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if String Duper 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.