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McJtyLibMinecraft mod for 1.21.1

Library mod used by most mods by McJty and romelo333 (RFTools, XNet, Deep Resonance, Not Enough Wands, SignTastic, etc.)

client and servernewest supported 1.21.1Library
Latest version
1.21-9.0.21
Minecraft
1.7.10 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
MIT
Downloads
654.3k
Updated
3 mo ago
Available on
Modrinth
Space NodePartner

Host McJtyLib servers

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

  • 1.21.1
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.20.1NeoForge, Forge17+declared12 Jun 2023
1.19.4Forge, NeoForge17+declared14 Mar 2023
1.19.3NeoForge, Forge17+declared7 Dec 2022
1.19.2NeoForge, Forge17+declared5 Aug 2022
1.19.1NeoForge, Forge17+declared27 Jul 2022
1.19Forge, NeoForge17+declared7 Jun 2022
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.18.1NeoForge, Forge17+declared10 Dec 2021
1.16.5Forge, NeoForge8+declared14 Jan 2021
1.16.4NeoForge, Forge8+declared29 Oct 2020
1.16.3NeoForge, Forge8+declared10 Sept 2020
1.16.2NeoForge, Forge8+declared11 Aug 2020
1.15.2NeoForge, Forge8+declared17 Jan 2020
1.14.4NeoForge, Forge8+declared19 Jul 2019
1.14.3NeoForge, Forge8+declared24 Jun 2019
1.14.2NeoForge, Forge8+declared27 May 2019
1.12.2Forge, NeoForge8+declared18 Sept 2017
1.12.1NeoForge, Forge8+declared3 Aug 2017
1.12NeoForge, Forge8+declared2 Jun 2017
1.11.2NeoForge, Forge8+declared21 Dec 2016
1.11NeoForge, Forge8+declared14 Nov 2016
1.10.2NeoForge, Forge8+declared23 Jun 2016
1.10NeoForge, Forge8+declared8 Jun 2016
1.9.4NeoForge, Forge8+declared10 May 2016
1.9NeoForge, Forge8+declared29 Feb 2016
1.8.9NeoForge, Forge8+declared3 Dec 2015
1.8.8NeoForge, Forge8+declared27 Jul 2015
1.7.10NeoForge, Forge8+declared14 May 2014

Download

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

All 30 releases
1.21-9.0.21beta16 Jun 2026

mcjtylib-1.21-9.0.21.jar · 0.7 MB · for 1.21.1

Download latest
3a349ea3718d…
Older versions24
  • 1.20-8.0.816 Jun 20261.20.10.7 MB3ebfff731da7…Get
  • 1.21-9.0.206 Dec 20251.21.10.7 MB26d98f9c2f46…Get
  • 1.21-9.0.192 Dec 20251.21.10.7 MBe74062968c68…Get
  • 1.21-9.0.1826 Nov 20251.21.10.7 MB483f3652b3d6…Get
  • 1.21-9.0.1716 Nov 20251.21.10.7 MBeeed586c71d8…Get
  • 1.21-9.0.166 Nov 20251.21.10.7 MBc04d268e6838…Get
  • 1.21-9.0.1524 Oct 20251.21.10.7 MB6c476304bbbf…Get
  • 1.21-9.0.1427 Sept 20251.21.10.7 MBcc99982c13fc…Get
  • 1.21-9.0.1321 Sept 20251.21.10.7 MBf50912235313…Get
  • 1.21-9.0.1211 Aug 20251.21.10.7 MBdd9f8088b204…Get
  • 1.21-9.0.112 Aug 20251.21.10.7 MB4bdc65b531af…Get
  • 1.21-9.0.1013 Jul 20251.21.10.7 MBac87fb42fd9c…Get
  • 1.20-8.0.728 May 20251.20.10.7 MB9f0ff2aa297b…Get
  • 1.21-9.0.918 May 20251.21.10.7 MB74f7fc09fb32…Get
  • 1.21-9.0.829 Mar 20251.21.10.7 MB5c8f155c8c2c…Get
  • 1.21-9.0.718 Mar 20251.21.10.7 MB4a1b215bd190…Get
  • 1.21-9.0.616 Mar 20251.21.10.7 MB962b98269561…Get
  • 1.21-9.0.54 Dec 20241.21.10.7 MB4f7821c33d78…Get
  • 1.21-9.0.422 Oct 20241.21.10.7 MB1e9643028c61…Get
  • 1.21-9.0.321 Oct 20241.21.10.7 MBd928b2d918e7…Get
  • 1.21-9.0.221 Oct 20241.21.10.7 MB039be2dcd1a0…Get
  • 1.21-9.0.128 Sept 20241.21.10.6 MBcdad3eb63929…Get
  • 1.21-9.0.014 Sept 20241.21.10.6 MB8c7a59da2ebc…Get
  • 1.20-8.0.610 Aug 20241.20.10.6 MB863c119b5e31…Get

Frequently asked

Does McJtyLib work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version McJtyLib 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 McJtyLib support?

Everything the author has declared, from 1.7.10 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install McJtyLib 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 loader does McJtyLib need?

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

Which Java version do I need for McJtyLib?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

What licence is McJtyLib under?

MIT, 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 McJtyLib?

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 McJtyLib safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

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

BookshelfAn open source library for other mods!GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Last checked 2 mo ago against Modrinth. 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? .