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JSSTMinecraft mod for 1.21.5

A suite of server-sided quality of life tweaks and survival-friendly tools.

server onlynewest supported 1.21.5UtilityGame Mechanics
Latest version
2.1.1+1.21.5
Minecraft
1.19 to 1.21.5
Java
Java 21+
Loaders
Quilt, Fabric
Licence
LicenseRef-All-Rights-Reserved
Downloads
4.5k
Updated
18 mo ago
Available on
Modrinth
Space NodeOur hosting

Host JSST servers

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

  • 1.21.5
  • Quilt
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5Quilt, Fabric21+declared25 Mar 2025
1.21.4Quilt, Fabric21+declared3 Dec 2024
1.21.1Fabric, Quilt21+declared8 Aug 2024
1.21Quilt, Fabric21+declared13 Jun 2024
1.20.1Fabric, Quilt17+declared12 Jun 2023
1.20Quilt, Fabric17+declared2 Jun 2023
1.19.4Fabric, Quilt17+declared14 Mar 2023
1.19.2Quilt, Fabric17+declared5 Aug 2022
1.19.1Quilt, Fabric17+declared27 Jul 2022
1.19Quilt, Fabric17+declared7 Jun 2022

Download

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

All 33 releases
2.1.1+1.21.5release27 Mar 2025

jsst-2.1.1+1.21.5.jar · 3.6 MB · for 1.21.5

Download latest
7d9cc94707d2…
Older versions24
  • 2.1.1+1.21.427 Mar 20251.21.43.6 MB71 downloads02e3a98cef4c…Get
  • 2.1.1+1.21.127 Mar 20251.21.1, 1.213.6 MB134 downloads187ab0593cb7…Get
  • 2.1.0+1.21.411 Mar 20251.21.43.6 MB83 downloads1d2cea588263…Get
  • 2.1.0+1.21.111 Mar 20251.21.1, 1.213.6 MB58 downloads6fb2c54896a8…Get
  • 2.0.1+1.21.422 Feb 20251.21.43.5 MB83 downloadsc44f7026977f…Get
  • 2.0.1+1.21.122 Feb 20251.21.1, 1.213.5 MB74 downloadse145e9069aff…Get
  • 2.0.0+1.21.115 Feb 20251.21.1, 1.213.1 MB75 downloads07d58caeab25…Get
  • 2.0.0+1.21.415 Feb 20251.21.43.1 MB72 downloads718652ba5a6e…Get
  • mc1.20-0.3.1413 Jul 20231.20.1, 1.200.6 MB756 downloads5927528115a7…Get
  • mc1.20-0.3.1212 Jun 20231.20.1, 1.200.6 MB182 downloadse72dfa2173f3…Get
  • mc1.19.4-0.3.1112 May 20231.19.40.6 MB200 downloads1f7053dc8bd6…Get
  • mc1.19.4-0.3.912 May 20231.19.40.6 MB104 downloads28f2e9d37be6…Get
  • mc1.19.4-0.3.711 May 20231.19.40.6 MB108 downloads8dcd84ecd5df…Get
  • mc1.19.4-0.3.611 May 20231.19.40.6 MB117 downloads3f96d0882684…Get
  • mc1.19.4-0.3.59 May 20231.19.40.6 MB120 downloadsc170deba6a75…Get
  • mc1.19.4-0.3.424 Apr 20231.19.40.6 MB117 downloads36abd041636d…Get
  • mc1.19.4-0.3.324 Apr 20231.19.40.5 MB96 downloads7d838cb2768e…Get
  • mc1.19.4-0.3.224 Apr 20231.19.40.5 MB112 downloads22432e95c195…Get
  • mc1.19.4-0.3.022 Apr 20231.19.40.5 MB108 downloadsb50c38790a59…Get
  • mc1.19.4-0.2.1417 Apr 20231.19.40.5 MB88 downloads8d6113d10bf9…Get
  • mc1.19.4-0.2.1317 Apr 20231.19.40.5 MB77 downloads5bae64f98248…Get
  • mc1.19.4-0.2.1217 Apr 20231.19.40.5 MB79 downloadsa725ecab717c…Get
  • mc1.19.4-0.2.1115 Apr 20231.19.40.5 MB75 downloadsb86f4412971c…Get
  • mc1.19.4-0.2.1015 Apr 20231.19.40.3 MB80 downloads3bb7a0f0d7e8…Get

Frequently asked

Does JSST work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version JSST 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 JSST support?

Everything the author has declared, from 1.19 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

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

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does JSST support?

Quilt, 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 JSST?

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 JSST under?

LicenseRef-All-Rights-Reserved, 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 JSST?

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 JSST 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 27 Mar 2025. 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? .