Just Core

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

Only the server needs the mod. Players can connect with an unmodified client.

Features

Stable JustCoreApi entry point for companion mods
Companion-module registration and diagnostics
Optional player-state providers for features such as vanish
Central append-only staff audit log
Public staff-action events for integrations
Built-in /justcore info and /justcore modules diagnostics
Designed for safe, optional interoperability between server-side administration mods
No gameplay content or client installation required

Audit system

Companion mods can record staff actions through one common API. Audit entries can include the timestamp, source module, action type, staff UUID, target UUID, and additional details.

Entries are stored in world/justcore/audit.jsonl using an append-only JSON Lines format suitable for external tools and future integrations.

Commands

/justcore info — Display the installed API version and registered module count
/justcore modules — List registered Just ecosystem modules

Commands require operator permission level 2.

Current status

Just Core 0.1.0 is an early development foundation. It adds no gameplay content by itself. Just Vanish does not currently require it, and Just Essentials remains in development.

Requirements

Minecraft 1.21.1
NeoForge 21.1.x
Java 21
Server-side installation only

Documentation

Complete installation, API, modules, auditing, events, commands, and compatibility documentation is available in the Just Core Wiki.

Official builds are distributed through CurseForge and Modrinth. Source code and bug reports are available on GitHub.