Minecraft displays the player inventory differently, according to how the window was opened. Ranges of slot indices vary in meaning between different “windows”. The Open Window packet indicates which window is being opened according to:

• Minecraft Armor Slots Mod
• Minecraft Armor Slots
• Minecraft Armor Slot Id

This mod is my reworked version of Cosmetic Armor. The original mod has a few bugs, and it is licensed under MIT License. The author hasn't fixed them, so I figured why not make my own version. This mod allows you to wear two sets of armor, one for display, one for function. You can also hide armor for your skin. Armor is a special type of item which players and certain types of mobs can wear for protection, decreasing the damage inflicted upon them. 1 Mechanics 2 List of armor (by slot) 2.1 Helmets/Caps 2.2 Chestplates/tunics 2.3 Leggings/pants 2.4 Boots 3 Armor types 3.1 Leather armor 3.2 Golden armor 3.3 Chainmail armor 3.4 Iron armor 3.5 Diamond armor 3.6 Netherite armor 3.7 Elytra 3.8 Turtle shell.

• 2Chest
• 4Furnace

Enable equipment Enter the text id of an item (for example stone or ironsword) into the appropriate slots. You can enter an arbitrary item for the head or hand, but the other slots must contain an appropriate item. Instead of 'slot.armor.head,' it's simply, 'armor.head' and instead of minecraft:banner id it's simply 'minecraft:banner.' With the new system you put tags in with the item instead of using the 'BlockEntryTag:' line at the end. Also the color values have been swapped, 15 being white, 0 being black.

The slot number is calculated starting at 0, counting up through the window's unique slots, and then counting through the players inventory.

For all windows, the slot in the upper-left corner of the player's inventory is slot n where n is the number of unique slots, and slot number -999 is always used for clicking outside the window.

The default inventory window, which is never explicitly opened by the server, has 10 unique slots.

Rectangular regions are always indexed starting with the upper-left corner and scanning across rows. If a window has a crafting region, the output slot is always slot 0 followed immediately by the input region.

Each window type is described in the following sections. All slot index ranges are inclusive and reflect the indices observed in the Minecraft protocol.

For the window properties (additional data in each window, e.g. smelting progress or enchantments), refer to the table in the Window Property packet.

Using -1 as slot index and as window id will set the cursor item (the stack dragged with the mouse).

Player Inventory

This is the inventory window that the player can always open, typically by pressing E since Beta 1.4. Before, you had to press I.

Note that this is different from inventory items stored in a player.dat file. This may help: https://gist.github.com/459a1691c3dd751db160

Chest

This is the window that is opened when the player right-clicks on a single chest block.

Large chest

This is the window that is opened when the player right-clicks on a double chest block (two adjacent chest blocks).

It is possible to receive different 'Number Of Slots' parameters than those two. In vanilla, using /setblock four times around a chest and then opening the middle chest will open a window with 5*27 chest slots. Some custom servers will send chest inventories with other sizes, usually ranging from 1 row to 6 rows. These may be used for custom GUIs. It is thus important to correctly use the 'Number Of Slots' parameter in the open window packet to determine the number of rows in the chest, rather than hardcoding what constitutes a regular chest or a large chest.

Crafting table

This is the window that is opened when the player right-clicks on a workbench.

If the 'Number Of Slots' parameter is not set to 0, the opened window will behave like a container window.

Furnace

The window that appears when a furnace is right-clicked.

If the 'Number Of Slots' parameter is inferior to 3, placing an item in a slot may crash the client.

Blast Furnace

The GUI that appears when a blast furnace is opened. Same layout as a furnace; however, the recipe book displays blast furnace recipes instead of regular furnace recipes.

Smoker

The GUI that appears when a smoker is opened. Same layout as a furnace; however, the recipe book displays blast furnace recipes instead of regular furnace recipes.

Dispenser

The inventory that appears when a dispenser or dropper is opened.

If the 'Number Of Slots' parameter is inferior to 9, placing an item in a slot may crash the client.

Enchantment Table

The inventory of an enchantment table. The enchant buttons trigger a Enchant item packet.

Brewing stand

The GUI that appears when a brewing stand is opened.

Minecraft Armor Slots Mod

Villager trading

The GUI that appears when a villager is right-clicked. Note that if the villager only requires one item, you can put it in either (or both) slots.

Beacon

The window that appears when a beacon is right-clicked.

Anvil

Hopper

The window that appears when a hopper or hopper minecart is opened.

Shulker box

This is the window that is opened when the player right-clicks on a shulker box chest.

Llama

The inventory that appears when a tamed llama is right-clicked and has a chest, or when the player's inventory is opened while riding a tamed llama. Depending on the value of the strength field, the number of chest rows may vary (max is 5, so 15 slots).

There still is a saddle slot, even though it cannot be used and is invisible.

Slot positions within the llama inventory vary - slot 2 may be at (1,0) or at (0,1) depending on the number of columns.

• Unchested llama

• Llama with strength 1

• Llama with strength 2

• Llama with strength 3

• Llama with strength 4

• Llama with strength 5

Horse

The window for when a tamed horse is right-clicked or the player's inventory is opened while riding a horse.

Minecraft Armor Slots

• Horse slots

• Skeleton horse slots

• Zombie horse slots

Donkey

The inventory that appears when a tamed donkey (or mule?) is right-clicked, or when the player's inventory is opened while riding a tamed donkey or mule.

There still is an armor slot, even though it cannot be used and is invisible.

• Unchested donkey

• Chested donkey

• Unchested mule

• Chested mule

Cartography Table

The GUI that appears when a cartography table is opened.

Grindstone

Lectern

This is a regular container, unlike with held books opened via Protocol#Open Book.

Loom

Stonecutter

Replaces items in the inventories of blocks (chest, furnaces, etc.) or entities (players or mobs) with the given item(s).

Syntax[edit]

• Java Edition

replaceitem block <pos> <slot> <item> [<count>]

replaceitem entity <targets> <slot> <item> [<count>]

• Bedrock Edition

replaceitem block <position: x y z> slot.container <slotId: int> <itemName: Item> [amount: int] [data: int] [components: json]

replaceitem entity <target: target> <slotType: EntityEquipmentSlot> <slotId: int> <itemName: Item> [amount: int] [data: int] [components: json]

replaceitem block <position: x y z> slot.container <slotId: int> <oldItemHandling: ReplaceMode> <itemName: Item> [amount: int] [data: int] [components: json]

replaceitem entity <target: target> <slotType: EntityEquipmentSlot> <slotId: int> <oldItemHandling: ReplaceMode> <itemName: Item> [amount: int] [data: int] [components: json]

Arguments[edit]

JE: <pos>: block_pos
BE: position: x y z: CommandPosition

In Java Edition, it must be a block position composed of <x>, <y> and <z>, each of which must be an integer or tilde and caret notation.In Bedrock Edition, it must be a three-dimensional coordinates composed of <x>, <y> and <z>, each of which must be a floating-point number or tilde and caret notation.

Specifies the position of the block to be modified.

JE: <targets>: entity
BE: target: target: CommandSelector<Actor>

Must be a player name, a target selector or a UUID‌^{[Java Edition only]}.

Specifies one or more entities to modify.

JE: <slot>: item_slot
BE: slotType: EntityEquipmentSlot: EquipmentSlot, slot.container and <slotId: int>: int

Specifies the inventory slot to be modified. Valid values depend on whether a block or an entity is being modified.

In Bedrock Edition, slotId: int must be a 32-bit integer number. And it must be between -2147483648 and 2147483647 (inclusive).

• Chests, dispensers, droppers, hoppers, and trapped chests are numbered 0 for the top-left slot and then increase first horizontally, then vertically (so, for example, a chest's top row slots are numbered 0 to 8 from left to right). Double chests and double trapped chests are treated as two single container blocks.
• A brewing stand's bottom slots are numbered 0 to 2 from left to right, its top slot is 3 and the fuel slot is 4.
• A furnace's slots are numbered 0 for the input slot, 1 for the fuel slot, and 2 for the output slot.

JE: <item>: item_stack
BE: itemName: Item: CommandItem

Specifies the item to be placed in the block or entity's inventory slot.

JE: <count>: integer
BE: amount: int: int

Must be a 32-bit integer number. In Java Edition, it must be between -2147483648 and 2147483647 (inclusive). And it must be between 1 and 64 (inclusive).

Specifies the number of items to be placed in the block or entity's inventory slot.

BE: data: int: int

Must be a 32-bit integer number. It must be between -2147483648 and 2147483647 (inclusive).

Specifies the item data for the item(s) to be placed in the block or entity's inventory slot. Values which are invalid for the specified item id will default to 0. If not specified, defaults to 0.

BE: components: json: Json::Value

Must be a JSON Object.

Specifies the item components. Like data tags but supports only minecraft:can_place_on, minecraft:can_destroy, minecraft:item_lock, and minecraft:keep_on_death functions (see Commands/give#Examples)

BE: oldItemHandling: ReplaceMode

Must be one of:

destroy - Directly replaces items ignoring the original items in the specified slot.

keep - Does not replace items if an item occupies that slot.

Result[edit]

Output[edit]

Examples[edit]

• To replace the items in the bottom-right slot of a single chest two block above with four spruce saplings:
  • replaceitem block ~ ~2 ~ container.26 minecraft:spruce_sapling 4‌^{[Java Edition only]}
  • replaceitem block ~ ~2 ~ slot.container 26 sapling 4 1‌^{[Bedrock Edition only]}
• To replace the items in the rightmost hotbar slot of the nearest player with four spruce saplings:
  • replaceitem entity @p hotbar.8 minecraft:spruce_sapling 4‌^{[Java Edition only]}
  • replaceitem entity @p slot.hotbar 8 sapling 4 1‌^{[Bedrock Edition only]}

Minecraft Armor Slot Id

History[edit]

See also[edit]

• /blockdata — can also replace items in a container
• /entitydata — can also replace items in a mob's inventory, or modify the drop chances of armor and weapons
• /give — give items to players without specifying specific inventory slots or overwriting other items