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Truly Modular - Modular Item API

A Modular Item API
by Smartin_b
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Updated Jun 30, 2026
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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:

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?
  • Can I write an addon for this?
    • Yes, for any help feel free to visit our discord or check the API wiki for additional help.
  • Can I use this in a modpack?
    • yes
Truly Modular - Modular-Item-API v2.3.8-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-06-18 Get
Truly Modular - Modular-Item-API v2.3.8-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-06-18 Get
Truly Modular - Modular-Item-API v2.3.7-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-06-10 Get
Truly Modular - Modular-Item-API v2.3.7-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-06-10 Get
Truly Modular - Modular-Item-API v2.3.6-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-23 Get
Truly Modular - Modular-Item-API v2.3.6-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-23 Get
Truly Modular - Modular-Item-API v2.3.5-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-16 Get
Truly Modular - Modular-Item-API v2.3.5-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-16 Get
Truly Modular - Modular-Item-API v2.3.4-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-14 Get
Truly Modular - Modular-Item-API v2.3.4-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-14 Get
Truly Modular - Modular-Item-API v2.3.3-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-09 Get
Truly Modular - Modular-Item-API v2.3.3-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-09 Get
Truly Modular - Modular-Item-API v2.3.2-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-02 Get
Truly Modular - Modular-Item-API v2.3.2-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-02 Get
Truly Modular - Modular-Item-API v2.3.0-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-01 Get
Truly Modular - Modular-Item-API v2.3.0-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-01 Get
Truly Modular - Modular-Item-API v2.3.1-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-04-01 Get
Truly Modular - Modular-Item-API v2.3.1-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-04-01 Get
Truly Modular - Modular-Item-API v1.1.49-1.20.1
MC Client, Fabric, 1.20.1, Server, Quilt
Release 2026-03-08 Get
Truly Modular - Modular-Item-API v1.1.49-1.20.1
MC Client, 1.20.1, Forge, NeoForge, Server
Release 2026-03-08 Get
Truly Modular - Modular-Item-API v2.2.3-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-01-23 Get
Truly Modular - Modular-Item-API v2.2.3-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-01-23 Get
Truly Modular - Modular-Item-API v2.2.2-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-01-21 Get
Truly Modular - Modular-Item-API v2.2.2-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-01-21 Get
Truly Modular - Modular-Item-API v2.2.1-1.21
MC 1.21, Client, Fabric, 1.21.1, Server, Quilt
Release 2026-01-14 Get
Truly Modular - Modular-Item-API v2.2.1-1.21
MC 1.21, Client, 1.21.1, NeoForge, Server
Release 2026-01-14 Get
Truly Modular - Modular-Item-API v2.1.1-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-10-07 Get
Truly Modular - Modular-Item-API v2.1.1-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-10-07 Get
Truly Modular - Modular-Item-API v1.1.48-1.20.1
MC Fabric, Client, 1.20.1, Server, Quilt
Release 2025-08-25 Get
Truly Modular - Modular-Item-API v1.1.48-1.20.1
MC Client, NeoForge, 1.20.1, Forge, Server
Release 2025-08-25 Get
Truly Modular - Modular-Item-API v2.1.0-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-08-25 Get
Truly Modular - Modular-Item-API v2.1.0-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-08-25 Get
Truly Modular - Modular-Item-API v1.1.47-1.20.1
MC Fabric, Client, 1.20.1, Server, Quilt
Release 2025-07-27 Get
Truly Modular - Modular-Item-API v1.1.47-1.20.1
MC Client, NeoForge, 1.20.1, Forge, Server
Release 2025-07-27 Get
Truly Modular - Modular-Item-API v1.1.46-1.20.1
MC Fabric, Client, 1.20.1, Server, Quilt
Release 2025-07-26 Get
Truly Modular - Modular-Item-API v1.1.46-1.20.1
MC Client, NeoForge, 1.20.1, Forge, Server
Release 2025-07-26 Get
Truly Modular - Modular-Item-API v1.1.45-1.20.1
MC Client, NeoForge, 1.20.1, Forge, Server
Release 2025-07-19 Get
Truly Modular - Modular-Item-API v1.1.45-1.20.1
MC Fabric, Client, 1.20.1, Server, Quilt
Release 2025-07-19 Get
Truly Modular - Modular-Item-API v2.0.12-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-06-17 Get
Truly Modular - Modular-Item-API v2.0.12-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-06-17 Get
Truly Modular - Modular-Item-API v2.0.11-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-05-27 Get
Truly Modular - Modular-Item-API v2.0.11-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-05-27 Get
Truly Modular - Modular-Item-API v2.0.10-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-05-20 Get
Truly Modular - Modular-Item-API v2.0.10-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-05-20 Get
Truly Modular - Modular-Item-API v2.0.9-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-05-13 Get
Truly Modular - Modular-Item-API v2.0.9-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-05-13 Get
Truly Modular - Modular-Item-API v2.0.8-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-05-08 Get
Truly Modular - Modular-Item-API v2.0.8-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-05-08 Get
Truly Modular - Modular-Item-API v2.0.7-1.21
MC 1.21, Fabric, Client, 1.21.1, Server, Quilt
Release 2025-04-27 Get
Truly Modular - Modular-Item-API v2.0.7-1.21
MC 1.21, Client, NeoForge, 1.21.1, Server
Release 2025-04-27 Get

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