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HammerLibMinecraft mod for 1.21.4

Library used by all of DragonForge team's mods.

newest supported release 1.21.4Library Api
Latest version
[1.21] HammerLib - 21.0.17
Minecraft
1.10.2 to 1.21.4
Java
Java 21+
Loaders
NeoForge, Forge
Licence
not stated
Downloads
58.1M
Updated
28 d ago
Available on
CurseForge

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4NeoForge, Forge21+declared3 Dec 2024
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.21Forge, NeoForge21+declared13 Jun 2024
1.20.6NeoForge, Forge21+declared29 Apr 2024
1.20.5NeoForge, Forge21+declared23 Apr 2024
1.20.4Forge, NeoForge17+declared7 Dec 2023
1.20.3NeoForge, Forge17+declared4 Dec 2023
1.20.2NeoForge, Forge17+declared20 Sept 2023
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.20NeoForge, Forge17+declared2 Jun 2023
1.19.3NeoForge, Forge17+declared7 Dec 2022
1.19.2NeoForge, Forge17+declared5 Aug 2022
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.18.1NeoForge, Forge17+declared10 Dec 2021
1.16.5Forge, NeoForge8+declared14 Jan 2021
1.16.3Forge, NeoForge8+declared10 Sept 2020
1.15.2NeoForge, Forge8+declared17 Jan 2020
1.13.2NeoForge, Forge8+declared22 Oct 2018
1.12.2NeoForge, Forge8+declared18 Sept 2017
1.12.1NeoForge, Forge8+declared3 Aug 2017
1.12Forge, NeoForge8+declared2 Jun 2017
1.11.2NeoForge, Forge8+declared21 Dec 2016
1.11Forge, NeoForge8+declared14 Nov 2016
1.10.2NeoForge, Forge8+declared23 Jun 2016

Download

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

Browse 43 indexed releases

For Minecraft 1.21.4

Choose the loader you use before downloading.

  • NeoForge

    [1.21.4] HammerLib - 21.4.5 · 5 Mar 2025 · HammerLib-1.21.4-21.4.5.jar

    Get NeoForge

Most recently published release

[1.21] HammerLib - 21.0.17release25 Sept 2026

HammerLib-1.21-21.0.17.jar · 2.3 MB · for 1.21.1, 1.21 · NeoForge

Download this release
0c6314c727d5…
Older versions24
  • [1.21] HammerLib - 21.0.1615 Sept 20261.21.1, 1.212.3 MB017c7ecd40fb…Get
  • [1.21] HammerLib - 21.0.159 Sept 20261.21.1, 1.212.1 MB3559ce265ed0…Get
  • [1.12.2] HammerLib - 12.2.6614 Jul 20261.12.22.5 MB559 downloadsc7ac28f4c7b8…Get
  • [1.12.2] HammerLib - 12.2.6527 Jun 20261.12.22.5 MB7.4k downloads4564b78c47a2…Get
  • [1.12.2] HammerLib - 12.2.6313 Jun 20261.12.22.5 MB5.7k downloads44b5b3b050cd…Get
  • [1.12.2] HammerLib - 12.2.627 Jun 20261.12.22.5 MB80692d5ae41b…Get
  • [1.12.2] HammerLib - 12.2.613 Jun 20261.12.22.5 MBa2b80e7688f6…Get
  • [1.12.2] HammerLib - 12.2.601 Jun 20261.12.22.4 MB543 downloadsc20b0b96a39e…Get
  • [1.12.2] HammerLib - 12.2.5931 May 20261.12.22.4 MB470 downloadse6e10602a008…Get
  • [1.12.2] HammerLib - 12.2.5826 Mar 20251.12.22.5 MB449.7k downloadsd693d897584c…Get
  • [1.20.1] HammerLib - 20.1.5023 Mar 20251.20.12.3 MB610.0k downloads8cd108a78702…Choose file on publisher ↗
  • [1.21.4] HammerLib - 21.4.55 Mar 20251.21.42.4 MB943 downloads4021b31a7740…Get
  • [1.21.4] HammerLib - 21.4.45 Mar 20251.21.42.4 MB25 downloads3abc26c29457…Get
  • [1.21.4] HammerLib - 21.4.35 Mar 20251.21.42.4 MB14 downloadsb6cd2c72a5d5…Get
  • [1.21.4] HammerLib - 21.4.24 Mar 20251.21.42.4 MB18 downloads3cd094aefb5f…Get
  • [1.21.4] HammerLib - 21.4.14 Mar 20251.21.42.2 MB15 downloadse076976b686f…Get
  • [1.20.1] HammerLib - 20.1.4818 Jan 20251.20.12.3 MB527.9k downloads439fe4bf635a…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.4718 Jan 20251.20.12.3 MB1.2k downloads7a2c33cec43b…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.4618 Jan 20251.20.12.3 MB1.6k downloads2c09c284a3f8…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.4517 Jan 20251.20.12.3 MB1.7k downloads1ed32a62b9ca…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.4413 Jan 20251.20.12.3 MB15.2k downloads2fd6af169fa4…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.4313 Jan 20251.20.12.3 MB2.8k downloadsb7327ccb3b30…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.416 Jan 20251.20.12.3 MB152.6k downloadsccce5d234d05…Choose file on publisher ↗
  • [1.20.1] HammerLib - 20.1.394 Jan 20251.20.12.3 MB7.3k downloads963728c21d45…Choose file on publisher ↗

Frequently asked

Does HammerLib work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version HammerLib 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 HammerLib support?

Everything the author has declared, from 1.10.2 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does HammerLib support?

NeoForge, Forge. 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 HammerLib?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install HammerLib?

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 HammerLib safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available 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 CurseForge, where the author last updated it on 2 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .