{{exclusive|java}}
The '''command_storage_''<namespace>''.dat''' files are {{w|Gzip}} compressed [[NBT Format|NBT]] files located in the <samp>data</samp> folder in a savegame. They store information about the {{cmd|data}} [[command storage]] in the world. Each [[namespace]] in the storage has its own data file.

== Usage ==
The command storage of [[NBT]] data is an efficient way for [[commands]] to access or save NBT data without an overhead for [[block entities]] or [[entities]] reading from or writing to the NBT data.

Each command storage is a general purpose, key-value storage, identified by a [[resource location]] to prevent unintentional conflicts.

{{cmd|data get|link=none}} and {{cmd|data modify|link=none}} can read from the storage, while {{cmd|data merge|link=none}}, {{cmd|data modify|link=none}}, {{cmd|data remove|link=none}}, and {{cmd|execute store}} can write to the storage.

The command storage is accessible with [[JSON text]] as well.

== Folder Structure ==
{| data-description="List"
|-
|<div class="toccolours treeview">
*''(world save directory)''
**data
***command_storage_''<namespace>''.dat
</div>
|}
Multiple {{cd|command_storage_''<namespace>''.dat}} files may be present in the {{cd|data}} directory.

== NBT structure ==
<div class="treeview">
* {{nbt|compound}} The root tag.
** {{nbt|compound|data}}: The actual saved data.
*** {{nbt|compound|contents}}: Contains all the data storage under the namespace of the command storage.
**** {{nbt|compound|''<name>''}}: The data associated with a particular [[resource location]] {{code|''<namespace>'':''<path>''}}.
***** Custom content as set by the {{cmd|data}} or {{cmd|execute store}} commands. 
** {{nbt|int|DataVersion}}: The [[data version]] in which this file is saved.
</div>
Multiple {{nbt|compound}} compound tags of different names may exist under {{nbt|compound|contents}} tag.

== History ==
{{HistoryTable
|{{HistoryLine|java}}
|{{HistoryLine||1.15|dev=19w38a|Added [[command storage]] data for the level.}}
}}

== Navigation ==
{{Navbox Java Edition technical|general}}

[[de:Datenspeicher]]
[[fr:Format de stockage des commandes]]
[[ja:コマンドストレージフォーマット]]
[[pt:Formato de armazenamento de comandos]]
[[zh:命令存储存储格式]]