AuthMod — Player Login & Registration for Forge 1.20.1

The first server-side authentication mod for Forge 1.20.1 with /register and /login.

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Features

• /register — register (min 4 characters)
• /login — login
• Full lockdown until authenticated:
  • Can't move
  • Can't break/place blocks
  • Can't drop/pickup items
• Saves passwords in authmod_data.json
• No OP required
• Works with FTB Essentials (/tpa, /home, etc.)

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Installation

1. Download authmod-1.0.0.jar from Releases
2. Place it in the mods folder on the server
3. Set spawn-protection=0 in server.properties
4. Start the server

New player → sees /register
Returning player → sees /login

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Compatibility

• Minecraft 1.20.1
• Forge 47.4.0+
• Server-side only — clients without the mod can join

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License: MIT
Author: d-society1
Releases: JAR + source code
Issues: Report bugs or suggest features!