ModsFinder

Jujutsu Craft Index Fix

by Almirion

Jujutsu Craft Index Fix is a Forge server-side fix for an index out of bounds multiplayer bug in JujutsuCraft.

ForgeServer required, client optionalAll rights reserved1.20.1 – 1.20.6

What it does

The fix targets a networking problem in JujutsuCraft, where clients running that mod can emit a malformed difficulty message during login and get kicked from the server. Installing it on the server stops those disconnects, so players who need an online connection to other players can join again. Only the server needs the fix: it must run it, while players may leave it out. Files cover 1.20.1 – 1.20.6 for Forge, and the mod is under All rights reserved, not open source.

Key features

  1. Login disconnect fix

    Stops a malformed difficulty message from JujutsuCraft clients from disconnecting players during login.

  2. Index bound error fix

    Addresses the index out of bounds error that appears in multiplayer sessions with JujutsuCraft.

  3. Server-side operation

    Runs on the server alone, so players joining a fixed server do not need to install anything extra.

Compatibility

Latest build for each game version and loader.

1.20.61.0.2
1.20.51.0.2
1.20.41.0.2
1.20.31.0.2
1.20.21.0.2
1.20.11.0.2
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

JujutsuFIN is a Forge mod for 1.20.1 that needs both client and server and is under All rights reserved. Index Helper is a Forge mod for 1.20.1 run on both sides and released under the MIT License, so it is not open source.

ModLoadersGame versionsEnvironmentUpdated
Jujutsu Craft Index FixForge1.20.1 – 1.20.6Server required, client optional2025-12-24
JujutsuFINForge1.20.1Client and server2026-08-02
Index HelperForge1.20.1Client and server2024-09-15

Questions

Does the server need to install Jujutsu Craft Index Fix?

Yes. The server must run the fix to stop the login disconnects, while players may leave it out.

Which game versions does the fix support?

Files exist for 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5 and 1.20.6, with 1.0.2 for 1.20.6 as the latest file.

In the catalog

Jujutsu Craft Index Fix is one of 8,016 Management mods on ModsFinder, and one of 2,698 Management mods for Forge. 11,154 mods support Minecraft 1.20.6.

Management mods8,016Forge modsMods for 1.20.611,154

More from Almirion

All projects
JJC NBT FIX1.20.1AHZNB´s NarutoOrigins1.12.2AHZNB`S Tweaks1.12.2AlmirionCore1.12.2 – 1.20.1Jujutsu ReBalanced1.20.1 – 1.20.6NinjaGallery1.12.2

Similar mods

Cherished Worlds1.12.2 – 26.3Default Options1.18 – 26.3Resourcify1.8.9 – 26.3Rebind Narrator1.16.1 – 26.1.2Paxi1.19.2 – 26.1.2Starter Kit1.16.5 – 26.3

What the author says

(Every Server is allowed to use this mod!) Jujutsu Craft Index Fix is a server side Forge mod created specifically for the Jujutsu Limitless RPG Minecraft server ( It fixes a known networking issue where clients running the JujutsuCraft mod send an invalid difficulty packet during login, which can cause players to be…
Almirion, on the Modrinth page

Official listing

Owner
Almirion
Published
2025-12-24
Updated on Modrinth
2025-12-24
Facts verified
2026-10-15

Tags

Game mechanicsManagementUtilityOptimization
Open on ModrinthCompare