CurseForge · Minecraft mod
Truly Modular - Modular Item API
A Modular Item API
Quick answer
Which Truly Modular - Modular Item API release should I use?
Truly Modular - Modular Item API Truly Modular - Modular-Item-API v2.3.9-1.21 targets 1.21, 1.21.1 with Fabric, Quilt. The project page does not say whether this file belongs on the client, dedicated server, or both. All 2 required mods have matching files.
Where it goes
Is Truly Modular - Modular Item API required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Truly Modular - Modular Item API Truly Modular - Modular-Item-API v2.3.9-1.21 need?
Truly Modular - Modular-Item-API v2.3.9-1.21. Change the file and its required mods may change too.
Install Architectury API, Fabric API first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Truly Modular - Modular Item API without breaking your instance.
Built for Truly Modular - Modular Item API Truly Modular - Modular-Item-API v2.3.9-1.21. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Truly Modular - Modular-Item-API v2.3.9-1.21. It targets 1.21, 1.21.1 with Fabric, Quilt; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Architectury API, Fabric API first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Truly Modular - Modular-Item-API v2.3.9-1.21. It opens that exact file at the source.
About this project
What does Truly Modular - Modular Item API add?
Truly Modular: Miapi
Truly Modular: Modular Item API is a modern cross-platform, data-driven Modular Item API. It allows addons/other mods to easily implement highly complex Modular Items.
Dependencies:
- Forge/Neoforge
- Fabric/Quilt
If you are a user, this API is basically contentless. Consider checking:
Arsenal
A melee weapon and tool-focused addon

Archery
Focusing on bows, crossbows, and modular arrows

Armory
Modular armor

For Developers:
- Miapi includes various default APIs to streamline cross-platform mod modular item mod development.
- Material stats and their reference:
- You can simply add a new key to the Material.json and reference them like this "armor_pen": "[material.hardness]*2.0 20", within the module.json
- For examples, one can always check the Arsenal, Archery, and Armory repositories.
- Usable GUI APIs and default extendable Crafter GUI.
- Complex module properties and custom per-property resolving.
- Almost 100 default materials and dozens of default properties to be used.
- Complex and extendable per-module rendering allowing easy implementation of custom new model types and by default extended 3D capabilities.
- Synergies, property injections, and skins are multiple systems that are able to add/modify a module's and/or item's properties.
- Generative Materials: Truly Modular automatically tries to scan other mods' content to add materials automatically. Handmade materials are obviously higher quality, but this adds a good bridge while there is no dedicated compatibility.
- If you have any additional questions, feel free to ask on our discord.
FAQ:
- What launcher is this for? Forge? Fabric?
- Both, check the jars
- Backport to older versions?
- Is not planned. There are many features in Truly Modular which have a significantly higher priority than backporting. Once the list of ideas is smaller, we might consider backporting.
- Is X mod supported?
- probably? Generative Compatiblity has a high chance of working with most mods out of the box. You can check https://github.com/Truly-Modular/Modular-Item-API/blob/main/COMPAT.md for more informations or to report issues
- Can I write an addon for this?
- Can I use this in a modpack?
- yes
Project description from CurseForge.
Pick your setup
Truly Modular - Modular Item API by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
3 loader builds1.21
3 loader builds1.20.1
4 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Truly Modular - Modular Item API versions and loaders
Truly Modular - Modular-Item-API v2.3.9-1.21
Truly-Modular-miapi-fabric-2.3.9-1.21.jar
24 Aug 2026
Truly Modular - Modular-Item-API v2.3.9-1.21
Truly-Modular-miapi-neoforge-2.3.9-1.21.jar
24 Aug 2026
Truly Modular - Modular-Item-API v2.3.8-1.21
Truly-Modular-miapi-fabric-2.3.8-1.21.jar
18 Jun 2026
Truly Modular - Modular-Item-API v2.3.8-1.21
Truly-Modular-miapi-neoforge-2.3.8-1.21.jar
18 Jun 2026
Truly Modular - Modular-Item-API v2.3.7-1.21
Truly-Modular-miapi-neoforge-2.3.7-1.21.jar
10 Jun 2026
Truly Modular - Modular-Item-API v2.3.7-1.21
Truly-Modular-miapi-fabric-2.3.7-1.21.jar
10 Jun 2026
Truly Modular - Modular-Item-API v2.3.6-1.21
Truly-Modular-miapi-fabric-2.3.6-1.21.jar
23 Apr 2026
Truly Modular - Modular-Item-API v2.3.6-1.21
Truly-Modular-miapi-neoforge-2.3.6-1.21.jar
23 Apr 2026
Truly Modular - Modular-Item-API v2.3.5-1.21
Truly-Modular-miapi-neoforge-2.3.5-1.21.jar
16 Apr 2026
Truly Modular - Modular-Item-API v2.3.5-1.21
Truly-Modular-miapi-fabric-2.3.5-1.21.jar
16 Apr 2026
Truly Modular - Modular-Item-API v2.3.4-1.21
Truly-Modular-miapi-neoforge-2.3.4-1.21.jar
14 Apr 2026
Truly Modular - Modular-Item-API v2.3.4-1.21
Truly-Modular-miapi-fabric-2.3.4-1.21.jar
14 Apr 2026
Looking for an older file? The official CurseForge project page is in Resources.