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Auto Login

A client-side Fabric mod that automatically logs you into authentication-based Minecraft servers (e.g. EasyAuth, AuthMe) using a locally encrypted password.

This mod runs entirely on the client and does not modify any server behavior.

Features

Automatically sends /login <password> after joining a server
Password is stored locally and encrypted (AES-GCM with random device key)
No server-side plugin or mod required
Client-only and suitable for multiplayer servers
Manual command trigger for testing or fallback use

Commands

Set password (required once)

/autologin set <password>

Encrypts and saves the password locally
Enables auto-login automatically

Trigger auto-login immediately

/autologin login

Runs a login attempt immediately
Useful for testing or manual retries

Enable / disable

/autologin on
/autologin off

Clear saved password

/autologin clear

Deletes stored credentials
Disables auto-login

How It Works

On first setup, the password is encrypted and saved locally
When you join a server:

The mod waits until the client is fully initialized
Then sends the login command directly to the server

The password is never sent anywhere else and is never logged

The mod does not intercept packets, modify UI, or hook into server authentication logic.

Security Notes

Passwords are stored only on your local machine
Encryption uses:
- Random 256-bit device key (generated per installation, not derivable from public info)
- AES-GCM (authenticated encryption)
The encryption key is stored in a separate file from the config
No plaintext password is written to disk
Do not reuse important real-world passwords

Supported Versions

Minecraft 26.1.2
Fabric Loader 0.19.2+
Fabric API 0.150.0+
Java 25

License

MIT