Composer
Composer gives Fabric developers shared systems, utilities and architectural building blocks that other mods can build on.
What it does
Composer is published by Project Codex in the Library category and is also tagged Management and Utility. It is meant for developers who want shared code to build on, aimed at improving quality-of-life while writing Fabric mods. Its focus is clean APIs, long-term stability and support for several Minecraft versions. Composer adds no gameplay content of its own, with the exception of a plushie.
Both the server and every player need the mod, since it runs on client and server. Composer requires Cardinal Components API, Fabric API and Fzzy Config, and Mod Menu is optional. Files are published for Fabric only, across 19 release versions 1.20.1 – 26.2, and the latest Fabric file is 4.3.2-build.67+mc26.2 for 26.2. The license is Creative Commons Attribution Non Commercial Share Alike 4.0, so the mod is not open source.
Key features
Shared utilities
Provides shared systems and utility code that other mods can call instead of writing their own.
Architectural building blocks
Supplies reusable structural pieces that appear across multiple mods built on top of it.
Runtime support for other mods
Other mods can rely on Composer at runtime, and it also supports them during development.
Stable public API
The API is kept clean and stable over time, with support for several Minecraft versions.
Gallery
Compatibility
Latest build for each game version and loader.
26.x4 of 4 versions with builds
1.21.x11 of 11 versions with builds
1.20.x4 of 4 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
Optional 1
Required by 2 mods
Use cases
Developing Fabric mods
Developers can use its shared code to reduce repetitive setup while building their own Fabric mods.
Mods that depend on it
Two catalog mods, Expeditive and Theatrical, require Composer and need it installed to run.
Who it’s for: Mod developers building on Fabric, and server owners running mods that list Composer as a requirement.
Questions
Does Composer need other mods installed?
Does the server need Composer?
Which Minecraft versions does Composer support?
In the catalog
Composer is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 13,894 mods support Minecraft 26.2.
Similar mods
What the author says
Composer is a general-purpose Fabric library mod developed under Project Codex. It provides shared systems, utilities, and architectural building blocks used across multiple mods, with a focus on clean APIs, long-term stability, and multi-version support. Composer does not add gameplay content on its own (except for…
Official listing
- Modrinth page
- modrinth.com/mod/composer
- Owner
- Project Codex
- Published
- 2025-07-23
- Updated on Modrinth
- 2026-10-01
- Facts verified
- 2026-10-15