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Potato Auth

by Mr_Potato

Potato Auth lets a Minecraft player log in automatically to chosen multiplayer servers, with its password kept encrypted.

FabricClient-side onlyMIT LicenseOpen source1.20 – 1.21.5

What it does

The mod stores login details for specific multiplayer servers so the player does not have to type them on each join. The author notes say the player can choose which servers get automatic login, and that passwords are encrypted before they are kept.

Because the environment is client-side only, the mod is installed by players and never by server owners, and servers need nothing extra to accept it. It is published for Fabric alone, with files covering 1.20 – 1.21.5 in thirteen release versions, the newest being 1.1 for 1.21.5, released 2025-11-27. Potato Auth is open source under the MIT License, and its source code and issue tracker are publicly linked.

Key features

  1. Stored login credentials

    Credentials for chosen multiplayer servers are kept so the login step is skipped when connecting.

  2. Per-server selection

    The player decides which servers receive the stored login, leaving other servers to be joined manually.

  3. Encrypted passwords

    Stored passwords are encrypted, so they are not kept in plain text on the player's machine.

Compatibility

Latest build for each game version and loader.

1.21.x6 of 6 versions with builds
1.21.51.1
1.21.41.1
1.21.31.1
1.21.21.1
1.21.11.1
1.211.1
1.20.x7 of 7 versions with builds
1.20.61.1
1.20.51.1
1.20.41.1
1.20.31.1
1.20.21.1
1.20.11.1
1.201.1
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Frequent server hopping

A player who joins the same few servers every day can skip the password prompt on each connection.

Who it’s for: Players who regularly join password-protected multiplayer servers and want the login handled automatically. Server owners do not need to install anything for it to work.

How it compares

Full comparison

Serverauth Mod is server-side only, not open source, under the MIT License, with files for 1.20 – 26.1.2, so players join without installing it. MineAuth is also server-side only and open source under the MIT License, but it targets 1.21.11 alone. IDELogin is the only alternative that runs on the client, is open source under the MIT License, and covers Fabric, Forge and NeoForge for 1.20 – 26.2.

ModLoadersGame versionsEnvironmentUpdated
Potato AuthFabric1.20 – 1.21.5Client-side only2025-11-27
Serverauth ModFabric1.20 – 26.1.2Server-side only2026-07-20
MineAuthFabric1.21.11Server-side only2026-01-06
IDELoginFabric, Forge and NeoForge1.20 – 26.2Client-side only2025-02-03

Questions

Does Potato Auth need to be on the server?

No. Only the player's game needs it, and servers run without it.

Which loader does Potato Auth support?

Potato Auth is published for Fabric only. Files cover 1.20 – 1.21.5, and the latest Fabric file is 1.1 for 1.21.5.

Are the saved passwords stored in plain text?

No. The author notes state that passwords are encrypted before they are kept on the player's machine.

In the catalog

Potato Auth is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 15,307 mods support Minecraft 1.21.5.

Technology mods8,499Fabric modsMods for 1.21.515,307

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What the author says

Have you every wanted to automatic login on a minecraft server? Now with Potato Auth you can.
Mr_Potato, on the Modrinth page

Official listing

Owner
Mr_Potato
Published
2025-11-17
Updated on Modrinth
2025-11-27
Facts verified
2026-10-15

Tags

ManagementTechnology
Open on ModrinthCompare