Data Command

Vanilla datapacks are limited to the built-in command set, and a trigger can only accept integers, so many systems that need real text input are out of reach. Data Command closes that gap by letting a datapack declare a command in JSON, receive arguments from the player, and run its own functions with those values. The commands are defined entirely through JSON and need no Java code from the pack author.

Data Command is a developer utility and library rather than a gameplay mod. It suits datapack authors who build authentication, town factions, in-game economies, class systems, dialogue, server tools and custom admin panels. Other projects can list it as a requirement, so most players will only meet it through the packs that need it.

The mod runs on Fabric for Minecraft 1.21.11 only. The server is the side that needs it, and clients need nothing extra for most packs. It is released as a first beta under the MIT License and is open source, so the source code and issue tracker are public. Because the APIs may still change in this early beta, packs that depend on it should be checked after each update.