Minecraft Command Storage

Command Storage Format

This content applies only to Java Edition.

Command storage files store the data of command storage.

Storage format

Files are located at <save root>/data/<namespace>/command_storage.dat, in GZip-compressed NBT format:

• Root tag
  • data (compound, required): command storage data.
    • contents (compound, required): the storage contents; <name> (compound) per namespace ID.
  • DataVersion (int, required): game data version; absent = 1343 (Java 1.12.2).

Storage behavior

Command storage lets commands and datapacks save data under namespace IDs directly, without items, block entities, or entities.

Writing:

• /execute ... store with target storage
• /data merge|modify|remove with source storage <target>

Reading:

• Text components with type nbt and storage specified
• /execute (if|unless) data with source storage
• /function ... with with source storage
• /data get with source storage <target>
• Item modifiers of type copy_custom_data with storage source
• Number providers of type storage

Setting storage data to {} deletes it. The file is created only when a command writes to storage; files load on demand and stay in memory.