Mod Coder Pack (26.1, 1.20.1) – Decompiling, Custom Minecraft Code Workspace

Mod Coder Pack (26.1, 1.20.1) is a tool that helps you decompile, study, and modify Minecraft source code to create custom clients.

How to use:

• Open the project in IntelliJ and import build.gradle.
• Open Gradle panel → run setup task (inside the mcp folder).
• 
• After setup:
  • Source code will appear in the src folder.
  • Edit the code as needed.
• To test:
  • Run runclient task, or use the generated Minecraft run configuration.
• To build:
  • Run build task.
  • Output file will be in build/libs/.
  • 

Make the custom version runnable:

• Go to Minecraft versions folder:
  • Windows: AppData/Roaming/.minecraft/versions
  • Linux: ~/.minecraft/versions
• Copy a base version folder (example: 1.16.5) and rename it (example: 1.16.5_custom).
• Inside the new folder:
  • Delete original .jar
  • Rename .json to match folder name
  • Edit "id" in JSON to match the new name
  • Remove the "downloads" section
• Copy your built .jar into this folder and rename it to match.
• Open both JAR files and copy:
  • assets folder
  • data folder
  • pack.png
  • pack.mcmeta
• Delete META-INF folder inside your new JAR.

Run in launcher:

• Restart Minecraft Launcher.
• Create a new installation.
• Select your custom version.
• Click Play.

Requires:

• Java requirements:
  • 1.17 and below → JDK 16
  • 1.18 – 1.20 → JDK 17
  • 1.21+ → JDK 21

Mod Coder Pack (26.1, 1.20.1) Download Links

For Minecraft 1.14.4

Download from Server 1

For Minecraft 1.15.2

Download from Server 1

For Minecraft 1.16.5

Download from Server 1

MOJO Mappings version: Download from Server 1

For Minecraft 1.17.1

Download from Server 1

For Minecraft 1.18.2

Download from Server 1

For Minecraft 1.19.2

Download from Server 1

For Minecraft 1.19.4

Download from Server 1

For Minecraft 1.20.1

Download from Server 1 – Download from Server 2

For Minecraft 1.20.2

Download from Server 1

For Minecraft 1.21+

Download from Server 1 – Download from Server 2