In Control documentation

In Control uses rule files to control mob spawning, attributes, loot, experience, player effects, block interactions, and more.

Current versions

For Minecraft 1.20.1, 1.21, and newer, start with one of these pages:

• Getting started — a first working rule, a file chooser, and the JSON basics
• Common recipes — copyable configurations organized by goal
• Technical reference — every system and advanced setting
• Troubleshooting — a diagnostic checklist and common failure modes

The current technical reference is based primarily on the Minecraft 1.20.1 implementation. Version-specific differences are called out where known.

Older versions

• Minecraft 1.18 and 1.19
• Minecraft 1.16
• Minecraft 1.12 and older legacy versions

Legacy filename

potentialspawn.json belongs to the old 1.12 system. On modern versions, use spawner.json. The two files have different structures.

Getting help

Validate modern spawn.json, spawner.json, and phases.json files with the Control Validator. For community help, see the McJty Discord invitation video.