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Truly Modular: Modular Item APIMinecraft mod for 1.21.1

This mod is the API designed for the Truly Modular mods

client and servernewest supported release 1.21.1UtilityLibrary
Latest version
2.3.9-1.21-fabric
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Quilt, NeoForge, Fabric, Forge
Licence
LicenseRef-Polyform-Shield-1.0.0-
Downloads
76.1k
Updated
3 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Truly Modular: Modular Item API servers

One click and Truly Modular: Modular Item API is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Quilt
  • NeoForge
  • Fabric
  • Forge
  • 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 Truly Modular: Modular Item API declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Quilt, NeoForge, Fabric, Forge21+declared8 Aug 2024
1.21NeoForge, Fabric, Forge, Quilt21+declared13 Jun 2024
1.20.1Fabric, Quilt, NeoForge, Forge17+declared12 Jun 2023

Download

From Truly Modular: Modular Item API’s own host. Nothing is re-hosted here.

Browse 62 indexed releases

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • Fabric, Quilt

    2.3.9-1.21-fabric · 24 Aug 2026

    Multiple loaders are listed; verify the file before downloading.

    Choose file on publisher ↗

  • NeoForge

    2.3.9-1.21-neoforge · 24 Aug 2026 · Truly-Modular-miapi-neoforge-2.3.9-1.21.jar

    Get NeoForge

Most recently published release

2.3.9-1.21-fabricrelease24 Aug 2026

Truly-Modular-miapi-fabric-2.3.9-1.21.jar · 3.7 MB · for 1.21.1, 1.21 · Fabric, Quilt

Choose file on publisher ↗
d648d630b313…
Older versions24
  • 2.3.9-1.21-neoforge24 Aug 20261.21.1, 1.213.8 MB9130923c0b04…Get
  • 2.3.8-1.21-neoforge18 Jun 20261.21.1, 1.213.7 MB1.9k downloads5fb24dc923bc…Get
  • 2.3.8-1.21-fabric18 Jun 20261.21.1, 1.213.7 MB353 downloadsfb7db4961698…Choose file on publisher ↗
  • 2.3.7-1.21-neoforge10 Jun 20261.21.1, 1.213.7 MB444 downloadsae9d25a489c3…Get
  • 2.3.7-1.21-fabric10 Jun 20261.21.1, 1.213.6 MB78 downloadsa4f4f7461c56…Choose file on publisher ↗
  • 2.3.6-1.21-neoforge23 Apr 20261.21.1, 1.213.6 MB2.6k downloads874b62e80a85…Get
  • 2.3.6-1.21-fabric23 Apr 20261.21.1, 1.213.5 MB391 downloads5592860f4b7e…Choose file on publisher ↗
  • 2.3.5-1.21-neoforge16 Apr 20261.21.1, 1.213.6 MB438 downloadsfb7a01201483…Get
  • 2.3.5-1.21-fabric16 Apr 20261.21.1, 1.213.5 MB53 downloadsfb4dc7de822f…Choose file on publisher ↗
  • 2.3.4-1.21-neoforge14 Apr 20261.21.1, 1.213.6 MB108 downloadsccc6d7655370…Get
  • 2.3.4-1.21-fabric14 Apr 20261.21.1, 1.213.5 MB31 downloads170a0f8539db…Choose file on publisher ↗
  • 2.3.3-1.21-fabric9 Apr 20261.21.1, 1.213.5 MB46 downloads003ffb4ef4c6…Choose file on publisher ↗
  • 2.3.3-1.21-neoforge9 Apr 20261.21.1, 1.213.6 MB112 downloads68acdfcb8a93…Get
  • 2.3.2-1.21-neoforge2 Apr 20261.21.1, 1.213.5 MB200 downloads99127b8be825…Get
  • 2.3.2-1.21-fabric2 Apr 20261.21.1, 1.213.5 MB100 downloads1cecc8f3f2df…Choose file on publisher ↗
  • 2.3.1-1.21-neoforge1 Apr 20261.21.1, 1.213.5 MB86 downloads3d8d6d626a12…Get
  • 2.3.1-1.21-fabric1 Apr 20261.21.1, 1.213.5 MB31 downloads83073165ce08…Choose file on publisher ↗
  • 2.3.0-1.21-fabric1 Apr 20261.21.1, 1.213.5 MB21 downloads7f045a4317b0…Choose file on publisher ↗
  • 2.3.0-1.21-neoforge1 Apr 20261.21.1, 1.213.5 MB27 downloads47e5bf4893fe…Get
  • 1.1.49-1.20.1-neoforge8 Mar 20261.20.13.3 MB2.0k downloads8a9c3fd18489…Choose file on publisher ↗
  • 1.1.49-1.20.1-fabric8 Mar 20261.20.13.1 MB1.2k downloads79278d09064e…Choose file on publisher ↗
  • 2.2.3-1.21-fabric23 Jan 20261.21.1, 1.213.3 MB447 downloadsf773220f9e7e…Choose file on publisher ↗
  • 2.2.3-1.21-neoforge23 Jan 20261.21.1, 1.213.4 MB1.8k downloads32dd3cb6dd18…Get
  • 2.2.2-1.21-neoforge21 Jan 20261.21.1, 1.213.4 MB64 downloads4133644c00e2…Get

Dependencies

What Truly Modular: Modular Item APIdeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.Architectury APIRequired. An intermediary api aimed to ease developing multiplatform mods.Caelus APIRequired. A coremod and API to provide developers access to elytra flight mechanics through an entity attribute.

Frequently asked

Does Truly Modular: Modular Item API work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Truly Modular: Modular Item API 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 Truly Modular: Modular Item API support?

Everything the author has declared, from 1.20.1 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 Truly Modular: Modular Item API 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 Truly Modular: Modular Item API support?

Quilt, NeoForge, Fabric, 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 Truly Modular: Modular Item API?

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.

What does Truly Modular: Modular Item API need to run?

It declares Fabric API, Architectury API and Caelus API as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is Truly Modular: Modular Item API under?

LicenseRef-Polyform-Shield-1.0.0-, 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 Truly Modular: Modular Item API?

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 Truly Modular: Modular Item API 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. 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.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!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+)

Details from Modrinth, where the author last updated it on 24 Aug 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? .