LibJF

LibJF is a library for my smaller mods which contains several common components.
Namely it provides:
- a complete config system with UIs, commands, compile-time codegen, presets, verifiers, etc
- a framework for manipulating loaded data and resources
- two new tags (which you can also use in data packs):
- libjf:overpowered: if an entity only wears armor items with this tag, it will become invulnerable
- libjf:shulker_boxes_illegal: items with this tag cannot be placed inside shulker boxes.
Intended to be used for backpacks or similar items
- utility code for serialization, script loading, co-processes, IO, etc.
- network utilities including a HTTP client and server
- a configurable and extensible translation system supporting various providers
- utilities for early initialization and ASM patching

If a mod is made by me, it is generally safe to assume it requires LibJF (or ships with parts of it)

If you want to use LibJF yourself, you can find documentation here

ABOUT THIS LISTING

This page describes LibJF by JFronny. The description and screenshots are the author's own, imported from their listing on Modrinth on 26 October 2026: https://modrinth.com/mod/libjf

Mythiq.net hosts no files for it. The download button goes straight to the release file on cdn.modrinth.com, so you are downloading from the author's own host, not from a copy of ours.

The download count, rating and comments on this page start at zero and count Mythiq.net only. The source's own figures are not copied here — they measure a different site, and a number that cannot be checked against our own ledger is not worth printing.

MOD LOADER

This release is built for Neoforge. A mod built for one loader will not load under another — Fabric mods do not run on Forge, and vice versa.

GAME VERSION

Built for Minecraft 26.3. Minecraft mods are tied to an exact version: a 1.21.4 build will refuse to load on 1.21.5.

THIS IS A LIBRARY

On its own it adds nothing you can see. It is here because other mods require it, and installing it is usually something another mod asked you to do.

DEPENDENCIES

Check the author's listing for required libraries before you start the game — a missing dependency shows up as a crash on launch, not as a warning.

1. Install Neoforge for the Minecraft version you play, if you have not already.

2. Download the .jar with the button on this page. Do not unzip it — a mod jar is installed as it is.

3. Put it in your mods folder:

Windows — %APPDATA%\.minecraft\mods

macOS — ~/Library/Application Support/minecraft/mods

Linux — ~/.minecraft/mods

4. Launch the game with the Neoforge profile selected.

ON A SERVER

Anything that changes world generation or gameplay has to be installed on the server as well as on every client. Client-side visual and interface mods do not.

UPDATING

Replace the old .jar rather than adding the new one beside it. Two versions of the same mod in the folder is a crash on launch.