LibJF

LibJF

A library for my mods

by
13.4M Downloads
fabricneoforgelibrary
Rent Server with this Mod

About this Mod

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

Suggestions and Support

Available Versions

[1.21.1] 3.17.7+forgerelease
MC 1.21.1neoforge
August 7, 2026
[26.1.2] 26.1.3release
MC 26.1.2fabric
July 26, 2026
[26.2] 26.2.1release
MC 26.2fabric
July 26, 2026
[26.2] 26.2.0release
MC 26.2fabric
June 17, 2026
[26.1] 26.1.2release
MC 26.1, 26.1.1, 26.1.2fabric
March 30, 2026

How to Install LibJF on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (26.2).

3

Install Mod

Open the mod browser in the dashboard and search for "LibJF". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricneoforge

Minecraft Versions

26.2, 26.1.2, 26.1.1 (+31 more)

Server-side

~ Optional

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

LibJF server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.2). You can switch loaders with one click in the panel.

Is LibJF compatible with fabric and neoforge?

LibJF officially supports fabric, neoforge for Minecraft 26.2, 26.1.2, 26.1.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with LibJF – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if LibJF consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install LibJF with just one click on your server.

Recommended RAM
4 GBfrom €5.2/mo
Minimum 3 GB | per 8 players
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Optional

Supported Versions

26.226.1.226.1.126.11.21.111.21.101.21.91.21.81.21.71.21.6+24 more