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JarsAuthMinecraft mod for 1.21.11

A Minecraft client management mod that provides many features to manage client connections

client and servernewest supported 1.21.11UtilityManagement
Latest version
6.1
Minecraft
1.16.5 to 1.21.11
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
GPL-3.0-only
Downloads
6.5k
Updated
8 mo ago
Available on
Modrinth
Space NodeOur hosting

Host JarsAuth servers

One click and JarsAuth is installed with the right loader, on hardware built for it.

  • 1.21.11
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version JarsAuth declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11NeoForge, Forge, Fabric21+declared9 Dec 2025
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.1Fabric, NeoForge, Forge21+declared8 Aug 2024
1.21NeoForge, Forge, Fabric21+declared13 Jun 2024
1.20.6Fabric, NeoForge, Forge21+declared29 Apr 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.1Forge, Fabric, NeoForge17+declared12 Jun 2023
1.19.4NeoForge, Forge, Fabric17+declared14 Mar 2023
1.19.3Fabric, NeoForge, Forge17+declared7 Dec 2022
1.19.2Forge, NeoForge, Fabric17+declared5 Aug 2022
1.18.2Forge, NeoForge, Fabric17+declared28 Feb 2022
1.17.1Forge, NeoForge, Fabric16+declared6 Jul 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021

Download

From JarsAuth’s own host. Nothing is re-hosted here.

6.1release8 Feb 2026

jarsauth-6.1-fabric-1.21.11.jar · 13.9 MB · for 1.21.11

Download latest
ed5aeeb180fe…
Older versions6
  • 5.09 Jul 20241.210.1 MB87 downloadsafeeb78691a3…Get
  • 4.416 Nov 20231.20.1, 1.19.4, 1.18.248 KB1.2k downloads52518a20e761…Get
  • 4.314 Nov 20231.20.1, 1.19.4, 1.18.247 KB447 downloads8e33e849e8c5…Get
  • 4.110 Nov 20231.20.1, 1.19.4, 1.18.247 KB546 downloads80cb4f9b931c…Get
  • 4.017 Oct 20231.20.1, 1.19.4, 1.18.248 KB447 downloads960fe932af68…Get
  • 1.0.020 Aug 20231.20.1, 1.19.4, 1.19.3, 1.19.2, 1.18.2 +2 more32 KB1.1k downloadsa00f73218625…Get

Frequently asked

Does JarsAuth work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version JarsAuth declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does JarsAuth support?

Everything the author has declared, from 1.16.5 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install JarsAuth on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does JarsAuth support?

NeoForge, Forge, Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for JarsAuth?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is JarsAuth under?

GPL-3.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install JarsAuth?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download JarsAuth safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 8 Feb 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .