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Monsters in the ClosetMinecraft mod for 1.21.9

Highlights mobs that are preventing you from sleeping

newest supported release 1.21.9Cosmetic
Latest version
[1.21.9] Version 1.0.3
Minecraft
1.16 to 1.21.9
Java
Java 21+
Loaders
Fabric, NeoForge
Licence
not stated
Downloads
4.2M
Updated
13 mo ago
Available on
CurseForge

Minecraft versions

Every version Monsters in the Closet declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.9Fabric, NeoForge21+declared30 Sept 2025
1.21.8Fabric, NeoForge21+declared17 Jul 2025
1.21.7Fabric, NeoForge21+declared30 Jun 2025
1.21.6Fabric, NeoForge21+declared17 Jun 2025
1.21.5Fabric, NeoForge21+declared25 Mar 2025
1.21.4Fabric, NeoForge21+declared3 Dec 2024
1.21.3Fabric, NeoForge21+declared23 Oct 2024
1.21.2Fabric, NeoForge21+declared22 Oct 2024
1.21.1NeoForge, Fabric21+declared8 Aug 2024
1.21Fabric, NeoForge21+declared13 Jun 2024
1.20.5Fabric, NeoForge21+declared23 Apr 2024
1.20.4Fabric, NeoForge17+declared7 Dec 2023
1.20.3Fabric, NeoForge17+declared4 Dec 2023
1.20.2NeoForge, Fabric17+declared20 Sept 2023
1.20.1Fabric, NeoForge17+declared12 Jun 2023
1.20Fabric, NeoForge17+declared2 Jun 2023
1.19.4Fabric, NeoForge17+declared14 Mar 2023
1.19.3Fabric, NeoForge17+declared7 Dec 2022
1.19.2Fabric, NeoForge17+declared5 Aug 2022
1.19.1Fabric, NeoForge17+declared27 Jul 2022
1.19Fabric, NeoForge17+declared7 Jun 2022
1.18.2Fabric, NeoForge17+declared28 Feb 2022
1.18.1Fabric, NeoForge17+declared10 Dec 2021
1.18NeoForge, Fabric17+declared30 Nov 2021
1.17Fabric, NeoForge16+declared8 Jun 2021
1.16.5Fabric, NeoForge8+declared14 Jan 2021
1.16.4Fabric, NeoForge8+declared29 Oct 2020
1.16.3Fabric, NeoForge8+declared10 Sept 2020
1.16.2Fabric, NeoForge8+declared11 Aug 2020
1.16.1Fabric, NeoForge8+declared24 Jun 2020
1.16Fabric, NeoForge8+declared23 Jun 2020

Download

From Monsters in the Closet’s own host. Nothing is re-hosted here.

For Minecraft 1.21.9

Choose the loader you use before downloading.

  • Fabric

    [1.21.9] Version 1.0.3 · 2 Oct 2025 · monsters-in-the-closet-1.0.3+1.21.9.jar

    Get Fabric

  • NeoForge

    [1.21.9 Neo] Version 1.0.3 · 2 Oct 2025 · monsters_in_the_closet-1.0.3+1.21.9-neo.jar

    Get NeoForge

Most recently published release

[1.21.9] Version 1.0.3release2 Oct 2025

monsters-in-the-closet-1.0.3+1.21.9.jar · 12 KB · for 1.21.9 · Fabric

Download this release
024a1e1ffaab…
Older versions16
  • [1.21.9 Neo] Version 1.0.32 Oct 20251.21.910 KBb44ba425bf78…Get
  • [1.21.8 Neo] Version 1.0.32 Oct 20251.21.8, 1.21.7, 1.21.610 KB7a287f0ec242…Get
  • [1.21.8] Version 1.0.329 Mar 20251.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4 +2 more12 KB9.1k downloads8c7cf665af8b…Get
  • [1.21.5 Neo] Version 1.0.328 Mar 20251.21.510 KB596 downloads3d571d848450…Get
  • [1.21.4 Neo] Version 1.0.328 Mar 20251.21.4, 1.21.3, 1.21.210 KB156 downloadsb6d08ff0539c…Get
  • [1.21 Neo] Version 1.0.313 Sept 20241.21.1, 1.2110 KB3.9k downloads1baf3e2a2e45…Get
  • [1.21] Version 1.0.325 Jul 20241.21.1, 1.2112 KB838.8k downloadsb54bbb904c17…Get
  • [1.20.5] Version 1.0.319 Apr 20241.20.512 KB468 downloads617b66b9e8a1…Get
  • [1.20] Version 1.0.31 Jun 20231.20.4, 1.20.3, 1.20.2, 1.20.1, 1.2012 KB383.3k downloads0d68812fe24b…Get
  • [1.19] Version 1.0.326 Oct 20221.19.4, 1.19.3, 1.19.2, 1.19.1, 1.1912 KB29.7k downloads4379d6c2b9d9…Get
  • [1.18] Version 1.0.35 Mar 20221.18.2, 1.18.1, 1.1812 KB10.6k downloads13f57612fb03…Get
  • [1.17] Version 1.0.210 Jun 20211.1712 KB13.4k downloads6902fda135d1…Get
  • [1.16] Version 1.0.210 Jun 20211.16.5, 1.16.4, 1.16.3, 1.16.212 KB6.3k downloadsc9b6a837e007…Get
  • [1.17] Version 1.0.18 Jun 20211.1710 KB348 downloadscaadd1a5821b…Get
  • [1.16] Version 1.0.128 May 20211.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1 +1 more10 KB1.5k downloadsb37928bea4e2…Get
  • [1.16] Version 1.0.018 Dec 20201.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1 +1 more12 KB36.2k downloadsfe9ebba9c912…Get

Frequently asked

Does Monsters in the Closet work on Minecraft 1.21.9?

Yes. 1.21.9 is the newest Minecraft version Monsters in the Closet 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 Monsters in the Closet support?

Everything the author has declared, from 1.16 up to 1.21.9. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Monsters in the Closet support?

Fabric, NeoForge. 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 Monsters in the Closet?

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 Monsters in the Closet?

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 Monsters in the Closet 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.

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.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.Xaero's MinimapDisplays the nearby world terrain, players, mobs, entities in the corner of your screen. Lets you create waypoints which help you find the locations you've marked.

Details from CurseForge, where the author last updated it on 2 Oct 2025. 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? .