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Just Core project artwork

CurseForge · Minecraft mod

Just Core

A lightweight server-side API providing shared modules, player states, events, and audit infrastructure for the Just mod ecosystem.

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

Quick answer

Which Just Core release should I use?

Updated 3 days ago
Latest stable file justcore-0.2.0.jar
Game version 1.21.1
Loader NeoForge

Just Core justcore-0.2.0.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Just Core 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 NeoForge
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 Just Core justcore-0.2.0.jar need?

justcore-0.2.0.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Just Core without breaking your instance.

Built for Just Core justcore-0.2.0.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use justcore-0.2.0.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

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

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside justcore-0.2.0.jar. It opens that exact file at the source.

About this project

What does Just Core add?

Just Core

Just Core is the server-side API and shared infrastructure layer for Just Vanish, Just Essentials, and future Just mods on Minecraft 1.21.1 with NeoForge.

API 2

  • Stable JustCoreApi entry point
  • Companion-module registry
  • Mutable player-state providers for features such as vanish
  • Central append-only audit log at world/justcore/audit.jsonl
  • Public StaffActionEvent
  • /justcore info and /justcore modules diagnostics
  • No client installation required

Just Core 0.2.0 is required by Just Vanish 1.3.1+ and Just Essentials 0.3.1+. It keeps shared contracts, module discovery, player states, and staff auditing independent from either feature mod.

Documentation

Installation, API concepts, modules, player states, auditing, events, and versioning are maintained in the Just Core Wiki.

Distribution

Official compiled releases are distributed through CurseForge and Modrinth. GitHub is used for documentation, issue reporting, security review, and compatibility assessment.

License

Copyright © 2026 Yo_Fred. All rights reserved. Viewing the source for security review, compatibility assessment, bug reports, and feature suggestions is permitted. Copying, modification, redistribution, derivative works, and commercial reuse are prohibited without written permission. See LICENSE.

Project description from CurseForge.

Pick your setup

Just Core by Minecraft version and loader

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1 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

Just Core versions and loaders

2 of 2 releases match

Looking for an older file? The official CurseForge project page is in Resources.

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