CurseForge · Minecraft mod

JJC Library

A core API and library mod for extending JujutsuCraft with custom cursed techniques, domains, and mob systems.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which JJC Library release should I use?

Updated today

Latest stable file jjclibrary-1.2.5.jar

Game version 1.20.1

Loader Forge

JJC Library jjclibrary-1.2.5.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. 1 required mod needs a matching file.

Where it goes

Is JJC Library required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release Forge

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does JJC Library jjclibrary-1.2.5.jar need?

jjclibrary-1.2.5.jar. Change the file and its required mods may change too.

1 required mod needs a matching file

Install SmartBrainLib (Forge/Fabric/Quilt) first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match.

SmartBrainLib (Forge/Fabric/Quilt) Needed by JJC Library jjclibrary-1.2.5.jar

required

No matching file

We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add JJC Library without breaking your instance.

Built for JJC Library jjclibrary-1.2.5.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use jjclibrary-1.2.5.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

Install SmartBrainLib (Forge/Fabric/Quilt) first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match.
03
Put it on the correct side

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside jjclibrary-1.2.5.jar. It opens that exact file at the source.

About this project

What does JJC Library add?

JJC Library

A lightweight API framework designed to expand the capabilities of JujutsuCraft. This mod serves as a dependency for addon developers, allowing them to bypass native MCreator constraints and cleanly integrate custom mechanics.

Note: This is a library mod. It does not add playable content on its own.

For Developers:

Custom Techniques & Skills: Register completely custom cursed techniques, passive skills, and physical attacks using a streamlined Java API (CustomTechnique & CustomSkill).
Domain Expansions: Built-in logic wrappers for executing custom Domain casting and active tick loops.
Mob System: Give custom entities authentic Cursed Energy regeneration and physical grade-based scaling using MobSystem.setupMobStats().
Seamless GUI Integration: Injects a "Custom Techniques Library" directly into JujutsuCraft's native selection screen.
Advancement Hooks: Easily grant advancements upon defeating custom mobs via built-in Mixin hooks.