NefAuth

A secure, server-only NeoForge 1.21.1 authentication mod with /login and /register commands.

NeoForge

Loaders: NeoForge
Downloads on Modrinth: 157
Followers on Modrinth: 1
version: 1
Updated: August 6, 2026Aug 6
Published: in 2026

In-game login prompt and security messages — Players receive chat prompts to register or login and cannot bypass authentication. · swipe

At a glance

Runs on NeoForge

For Minecraft 1.21.1

Server only — players don't need to install it

Latest version — 1.0.0 from August 6, 2026

License MIT — free

Where it's needed

In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.21.1

NefAuth - Simple Login & Register for NeoForge

A lightweight, secure, and server-only authentication mod designed for NeoForge 1.21.1.

Perfect for large modpacks like All the Mods (ATM) running in offline mode (online-mode=false) to prevent unauthorized access and account theft.

Features

Server-Only: Players do not need to install this mod on their clients. Just drop it into the server's mods folder.
Secure Hashing: Password protection using secure hashing algorithms (no plain-text passwords stored).
Session Management: Prevents players from moving, chatting, or executing commands before logging in.
NeoForge Native: Built specifically for NeoForge 1.21.1, ensuring maximum compatibility without the need for buggy hybrid server jars (like Arclight/Mohist).

Commands

`/register ` - Register a new account.
`/login ` - Log into your account.
`/changepassword ` - Change your current password.

Installation & Setup

Download the .jar file for NeoForge 1.21.1.
Place it into your server's mods directory.
Restart the server.

Passwords are saved in the usernamecache.json file.

FAQ

How to install NefAuth?

Install NeoForge for your Minecraft version, download NefAuth for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does NefAuth support?

NefAuth has builds for Minecraft 1.21.1.

Is NefAuth needed on the server?

Server only — players don't need to install it

License and source

MIT Licensefree to use and share with credit to the author

Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders