ModsJava
Just Auth
Just Auth and a little performance. Free Minecraft Java mod for 1.12, 1.12.1, 1.12.2.
⬇ Download on ModrinthQuick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.12, 1.12.1, 1.12.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — see the MC Java Mods guides for the full walkthrough.
Verified by MCModsHub
- Ships as JustAuth-1.0.jar — drop this file into the mods folder
- Download size: 1.8 MB
- Download link checked 20 Aug 2026 — working
These come from our own check of the pack file, not from the source page.