Composer
A library mod created to improve the QOL of developing fabric mods.
Screenshots
About this Mod
What is Composer?
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 a plushie). It exists to support other mods at runtime and during development.
For more details, take a look at the wiki!
Information like style and contributing guidelines are also there!
Old development usage docs
# Development UsageIf you want to use Composer as a library in your mod, add the Composer Maven repository and Cardinal Components
repository to your build file, then add Composer as a dependency.
Replace (latest_version) with the latest Composer version compatible with your Minecraft version.
Gradle (Groovy DSL) - build.gradle
# gradle.properties
composer_version = (latest_version)
// build.gradle
repositories {
// Before 3.0
maven {
name = "Composer Maven"
url = "https://dl.cloudsmith.io/public/lilbrocodes/composer-reloaded/maven/"
}
// After 3.0
maven {
name = "Composer Maven"
url = "https://dl.cloudsmith.io/public/project-codex/composer/maven/"
}
// After 3.0.4
maven {
name "Constructive"
url "https://dl.cloudsmith.io/public/lilbrocodes/constructive/maven/"
}
maven {
name = "Cardinal Components"
url = "https://maven.ladysnake.org/releases"
}
maven {
name "Fuzzy Hamsters"
url "https://maven.fzzyhmstrs.me/"
}
}
dependencies {
// <2.0
modImplementation "org.lilbrocodes:composer-reloaded:$composer_version"
// >=2.0 <3.0
modImplementation "org.lilbrocodes:composer-reloaded:$composer_version+mc$minecraft_version"
// >=3.0
modImplementation "com.codex:composer:$composer_version+mc$minecraft_version"
}
Gradle (Kotlin DSL) - build.gradle.kts
# gradle.properties
composer_version = (latest_version)
// build.gradle.kts
repositories {
// Before 3.0
maven("https://dl.cloudsmith.io/public/lilbrocodes/composer-reloaded/maven/") {
name = "Composer Maven"
}
// After 3.0
maven("https://dl.cloudsmith.io/public/project-codex/composer/maven/") {
name = "Composer Maven"
}
// After 3.0.4
maven("https://dl.cloudsmith.io/public/lilbrocodes/constructive/maven/") {
name = "Constructive"
}
maven("https://maven.ladysnake.org/releases") {
name = "Cardinal Components"
}
maven("https://maven.fzzyhmstrs.me/") {
name = "Fuzzy Hamsters"
}
}
dependencies {
// <2.0
modImplementation("org.lilbrocodes:composer-reloaded:$composer_version")
// >=2.0 <3.0
modImplementation("org.lilbrocodes:composer-reloaded:$composer_version+mc$minecraft_version")
// >=3.0
modImplementation("com.codex:composer:$composer_version+mc$minecraft_version")
}
Maven - pom.xml
<repositories>
<!-- Before 3.0 -->
<repository>
<id>composer-maven</id>
<url>https://dl.cloudsmith.io/public/lilbrocodes/composer-reloaded/maven/</url>
</repository>
<!-- After 3.0 -->
<repository>
<id>composer-maven</id>
<url>https://dl.cloudsmith.io/public/project-codex/composer/maven/</url>
</repository>
<!-- After 3.0.4 -->
<repository>
<id>constructive-maven</id>
<url>https://dl.cloudsmith.io/public/lilbrocodes/constructive/maven/</url>
</repository>
<repository>
<id>cardinal-components</id>
<url>https://maven.ladysnake.org/releases</url>
</repository>
<repository>
<id>fuzzy-hamsters</id>
<url>https://maven.fzzyhmstrs.me/</url>
</repository>
</repositories>
<dependencies>
<!-- <2.0 -->
<dependency>
<groupId>org.lilbrocodes</groupId>
<artifactId>composer-reloaded</artifactId>
<version>${composer.version}</version>
<scope>compile</scope>
</dependency>
<!-- >=2.0 <3.0 -->
<dependency>
<groupId>org.lilbrocodes</groupId>
<artifactId>composer-reloaded</artifactId>
<version>${composer.version}+mc${minecraft.version}</version>
<scope>compile</scope>
</dependency>
<!-- >=3.0 -->
<dependency>
<groupId>com.codex</groupId>
<artifactId>composer</artifactId>
<version>${composer.version}+mc${minecraft.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
Add the following property to your <properties> section:
<properties>
<composer.version>(latest_version)</composer.version>
</properties>
Available Versions
How to Install Composer on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Composer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.8 (+12 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Composer server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Composer compatible with fabric?
Composer officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.8. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Composer – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Composer consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install Composer with just one click on your server.
Details
- License
- Creative Commons Attribution Non Commercial Share Alike 4.0 International
- Server-side
- Required