What's Inside a Minecraft Mod JAR? (Forge & Fabric Structure)

Open up a Minecraft mod JAR: mods.toml and fabric.mod.json, mixins, assets, lang files, and obfuscation mappings — and how to inspect any mod in your browser.

The Container: A JAR Within a Game's Classpath

Mod Metadata: mods.toml and fabric.mod.json

Class Files: Your Mod's Logic

Mixins: Bytecode Surgery

Assets: Textures, Models, Sounds, Localizations

Data: Recipes, Loot Tables, Advancements

Obfuscation and Remapping

What You Can Safely Change