BLOCKS DOCUMENTATION
Version: 1.21.40.3

Index

Blocks
Block Components
Block Definition Properties
Block Description Properties
Block Event Responses
Block Trigger Components

Blocks

Block Components

Name

Type

Default Value

Description

bone_visibility

JSON Object

A JSON object that contains a list of key/value pairs that map from bone name in the specified geometry file (key) to a boolean that tells whether the bone should be visible or not (value).

minecraft:breathability

String

Determines whether the block is breathable by defining if the block is treated as a `solid` or as `air`. The default is `solid` if this component is omitted.

minecraft:collision_box

Boolean / JSON Object

true

Defines the area of the block that collides with entities. If set to true, default values are used. If set to false, the block's collision with entities is disabled. If this component is omitted, default values are used.

Name	Type	Default Value	Description
origin	Vector [a, b, c]	[-8.0, 0.0, -8.0]	Minimal position of the bounds of the collision box. "origin" is specified as [x, y, z] and must be in the range (-8, 0, -8) to (8, 16, 8), inclusive.
size	Vector [a, b, c]	[16.0, 16.0, 16.0]	Size of each side of the collision box. Size is specified as [x, y, z]. "origin" + "size" must be in the range (-8, 0, -8) to (8, 16, 8), inclusive.

minecraft:crafting_table

JSON Object

Makes your block into a custom crafting table which enables the crafting table UI and the ability to craft recipes. This component supports only "recipe_shaped" and "recipe_shapeless" typed recipes and not others like "recipe_furnace" or "recipe_brewing_mix". If there are two recipes for one item, the recipe book will pick the first that was parsed. If two input recipes are the same, crafting may assert and the resulting item may vary.

crafting_tags

Defines the tags recipes should define to be crafted on this table. Limited to 64 tags. Each tag is limited to 64 characters.
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table_name

Specifies the language file key that maps to what text will be displayed in the UI of this table. If the string given can not be resolved as a loc string, the raw string given will be displayed. If this field is omitted, the name displayed will default to the name specified in the "display_name" component. If this block has no "display_name" component, the name displayed will default to the name of the block.
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minecraft:custom_components

Array

Sets an ordered list of custom component names which are bound in script to be executed upon a block event.

minecraft:destructible_by_explosion

Boolean / JSON Object

true

Describes the destructible by explosion properties for this block. If set to true, the block will have the default explosion resistance. If set to false, this block is indestructible by explosion. If the component is omitted, the block will have the default explosion resistance.

Name	Type	Default Value	Description
explosion_resistance	Decimal	0	Sets the explosion resistance for the block. Greater values result in greater resistance to explosions. The scale will be different for different explosion power levels. A negative value or 0 means it will easily explode; larger numbers increase level of resistance.

minecraft:destructible_by_mining

Boolean / JSON Object

true

Describes the destructible by mining properties for this block. If set to true, the block will take the default number of seconds to destroy. If set to false, this block is indestructible by mining. If the component is omitted, the block will take the default number of seconds to destroy.

Name

Type

Default Value

Description

item_specific_speeds

Array

Optional array of objects to describe item specific block destroy speeds, each object contains an 'item' ItemDescriptor and a 'destroy_speed' float. This array currently requires UpcomingFeatures experiment to be enabled.

destroy_speed

Required.
A destroy speed applied while using the defined 'item'.
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item

Required.
An ItemDescriptor filtering for the item used while mining.
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seconds_to_destroy

Decimal

0.0

Sets the number of seconds it takes to destroy the block with base equipment. Greater numbers result in greater mining times.

minecraft:display_name

Localization String

Specifies the language file key that maps to what text will be displayed when you hover over the block in your inventory and hotbar. If the string given can not be resolved as a loc string, the raw string given will be displayed. If this component is omitted, the name of the block will be used as the display name.

minecraft:flammable

Boolean / JSON Object

Describes the flammable properties for this block. If set to true, default values are used. If set to false, or if this component is omitted, the block will not be able to catch on fire naturally from neighbors, but it can still be directly ignited.

Name	Type	Default Value	Description
catch_chance_modifier	Integer	5	A modifier affecting the chance that this block will catch flame when next to a fire. Values are greater than or equal to 0, with a higher number meaning more likely to catch on fire. For a "catch_chance_modifier" greater than 0, the fire will continue to burn until the block is destroyed (or it will burn forever if the "destroy_chance_modifier" is 0). If the "catch_chance_modifier" is 0, and the block is directly ignited, the fire will eventually burn out without destroying the block (or it will have a chance to be destroyed if "destroy_chance_modifier" is greater than 0). The default value of 5 is the same as that of Planks.
destroy_chance_modifier	Integer	20	A modifier affecting the chance that this block will be destroyed by flames when on fire. Values are greater than or equal to 0, with a higher number meaning more likely to be destroyed by fire. For a "destroy_chance_modifier" of 0, the block will never be destroyed by fire, and the fire will burn forever if the "catch_chance_modifier" is greater than 0. The default value of 20 is the same as that of Planks.

minecraft:friction

Decimal

0.4

Describes the friction for this block in a range of (0.0-0.9). Friction affects an entity's movement speed when it travels on the block. Greater value results in more friction.

minecraft:geometry

Identifier String

The description identifier of the geometry to use to render this block. This identifier must either match an existing geometry identifier in any of the loaded resource packs or be one of the currently supported Vanilla identifiers: "minecraft:geometry.full_block" or "minecraft:geometry.cross".

minecraft:light_dampening

Integer

The amount that light will be dampened when it passes through the block, in a range (0-15). Higher value means the light will be dampened more.

minecraft:light_emission

Integer

The amount of light this block will emit in a range (0-15). Higher value means more light will be emitted.

minecraft:loot

Path String

The path to the loot table, relative to the behavior pack. Path string is limited to 256 characters.

minecraft:map_color

String

Sets the color of the block when rendered to a map. The color is represented as a hex value in the format "#RRGGBB". May also be expressed as an array of [R, G, B] from 0 to 255. If this component is omitted, the block will not show up on the map.

minecraft:material_instances

JSON Object

The material instances for a block. Maps face or material_instance names in a geometry file to an actual material instance. You can assign a material instance object to any of these faces: "up", "down", "north", "south", "east", "west", or "*". You can also give an instance the name of your choosing such as "my_instance", and then assign it to a face by doing "north":"my_instance".

Material Instance

A material instance definition to map to a material instance in a geometry file. The material instance "*" will be used for any materials that don't have a match.

Name	Type	Default Value	Description
ambient_occlusion	Boolean	true	Should this material have ambient occlusion applied when lighting? If true, shadows will be created around and underneath the block.
face_dimming	Boolean	true	Should this material be dimmed by the direction it's facing?
render_method	String	opaque	The render method to use. Must be one of these options: "opaque" - Used for a regular block texture without an alpha layer. Does not allow for transparency or translucency. "double_sided" - Used for completely disabling backface culling. "blend" - Used for a block like stained glass. Allows for transparency and translucency (slightly transparent textures). "alpha_test" - Used for a block like the vanilla (unstained) glass. Does not allow for translucency, only fully opaque or fully transparent textures. Also disables backface culling.
texture	String		Texture name for the material.

minecraft:placement_filter

JSON Object

Sets rules for under what conditions the block can be placed/survive

conditions

List of conditions where the block can be placed/survive. Limited to 64 conditions.

Name

Type

Default Value

Description

allowed_faces

Array

List of any of the following strings describing which face(s) this block can be placed on: "up", "down", "north", "south", "east", "west", "side", "all". Limited to 6 faces.

block_filter

Array

List of blocks that this block can be placed against in the "allowed_faces" direction. Limited to 64 blocks. Each block in this list can either be specified as a String (block name) or as a BlockDescriptor. A BlockDescriptor is an object that allows you to reference a block (or multiple blocks) based on its tags, or based on its name and states. The fields of a BlockDescriptor are described below.

Name	Type	Default Value	Description
name	String		The name of a block.
states	Array		The list of Vanilla block states and their values that the block can have, expressed in key/value pairs.
tags	String	1	A condition using Molang queries that results to true/false that can be used to query for blocks with certain tags.

minecraft:queued_ticking

JSON Object

Triggers the specified event, either once, or at a regular interval equal to a number of ticks randomly chosen from the interval_range provided.

Name

Type

Default Value

Description

interval_range

Array

A range of values, specified in ticks, that will be used to decide the interval between times this event triggers. Each interval will be chosen randomly from the range, so the times between this event triggering will differ given an interval_range of two different values. If the values in the interval_range are the same, the event will always be triggered after that number of ticks.

looping

Boolean

true

Does the event loop? If false, the event will only be triggered once, after a delay equal to a number of ticks randomly chosen from the interval_range. If true, the event will loop, and each interval between events will be equal to a number of ticks randomly chosen from the interval_range.

on_tick

Trigger

The event that will be triggered once or on an interval.

Name	Type	Default Value	Description
condition	String	1	A condition using Molang queries that results to true/false. If true on the scheduled tick, the event will be triggered. If false on the scheduled tick, the event will not be triggered.
event	String	set_block_state	The event that will be triggered.
target	String	self	The target of the event executed by the block.

minecraft:random_ticking

JSON Object

Triggers the specified event randomly based on the random tick speed gamerule. The random tick speed determines how often blocks are updated. Some other examples of game mechanics that use random ticking are crop growth and fire spreading.

Name

Type

Default Value

Description

on_tick

Trigger

The event that will be triggered on random ticks.

Name	Type	Default Value	Description
condition	String	1	A condition using Molang queries that results to true/false. If true on the random tick, the event will be triggered. If false on the random tick, the event will not be triggered.
event	String	set_block_state	The event that will be triggered.
target	String	self	The target of the event executed by the block.

minecraft:redstone_conductivity

Identifier String

The basic redstone properties of a block; if the component is not provided the default values are used. Requires 1.21.30 format version and above.
Experimental toggles required: Upcoming Creator Features (in format versions before 1.21.30)

Name	Type	Default Value	Description
allows_wire_to_step_down	Boolean	true	Specifies if redstone wire can stair-step downward on the block.
redstone_conductor	Boolean	false	Specifies if the block can be powered by redstone.

minecraft:selection_box

Boolean / JSON Object

Defines the area of the block that is selected by the player's cursor. If set to true, default values are used. If set to false, this block is not selectable by the player's cursor. If this component is omitted, default values are used.

Name	Type	Default Value	Description
origin	Vector [a, b, c]	[-8.0, 0.0, -8.0]	Minimal position of the bounds of the selection box. "origin" is specified as [x, y, z] and must be in the range (-8, 0, -8) to (8, 16, 8), inclusive.
size	Vector [a, b, c]	[16.0, 16.0, 16.0]	Size of each side of the selection box. Size is specified as [x, y, z]. "origin" + "size" must be in the range (-8, 0, -8) to (8, 16, 8), inclusive.

minecraft:transformation

JSON Object

The block's translation, rotation and scale with respect to the center of its world position

rotation

The block's rotation in increments of 90 degrees
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rotation_pivot

The point to apply rotation around
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scale

The block's scale
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scale_pivot

The point to apply scale around
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translation

The block's translation
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minecraft:unit_cube

JSON Object

Specifies that a unit cube is to be used with tessellation.

Block Definition Properties

These properties are part of the Block Definition. This helps the system determine how to parse and initialize this block.

Name	Type	Default Value	Description
format_version	String		Specifies the version of the game this entity was made in. If the version is lower than the current version, any changes made to the entity in the vanilla version will be applied to it.

Code Example

Example

{
  "format_version": "1.21.40",
  "minecraft:block": {
    "description": {
      "identifier": "design:lavenderstone"
    },
    "components": {
      "minecraft:loot": "loot_tables/chests/simple_dungeon.json",
      "minecraft:destroy_time": 4.0,
      "minecraft:friction": 0.6,
      "minecraft:map_color": "#00ff00",
      "minecraft:flammable": {
        "flame_odds": 50,
        "burn_odds": 0
    },
      "minecraft:light_emission": 1
    }
  }
}

Block Description Properties

Name	Type	Default Value	Description
identifier	String		The identifier for this block. The name must include a namespace and must not use the Minecraft namespace unless overriding a Vanilla block.

Block Event Responses

Event responses for block trigger components.

Name

Type

Default Value

Description

add_mob_effect

JSON Object

Apply mob effect to target.

Name	Type	Default Value	Description
amplifier	Integer	0	The amplifier for the mob effect.
duration	Decimal	0.0	The duration of the mob effect.
effect	String		The mob effect to apply.
target	Minecraft Filter	self	The target context to execute against.

damage

JSON Object

Deals damage to the target.

Name	Type	Default Value	Description
amount	Integer	0	The amount of damage to deal.
mob_amount	Integer	0	The amount of damage to deal if held by a mob.
target	Minecraft Filter	self	The target context to execute against.
type	String		The type of damage to deal.

decrement_stack

JSON Object

Decrement item stack.

die

JSON Object

Kill target. If target is self and this is run from a block then destroy the block.

Name	Type	Default Value	Description
target	Minecraft Filter	self	The target context to execute against.

play_effect

JSON Object

Spawns a particle effect relative to target position.

Name	Type	Default Value	Description
data	Integer	0	Particle data value.
effect	String		The name of the particle effect to create.
target	Minecraft Filter	self	The target context to execute against.

play_sound

JSON Object

Play a sound relative to target position.

Name	Type	Default Value	Description
sound	String		The name of the sound to play.
target	Minecraft Filter	self	The target context to execute against.

remove_mob_effect

JSON Object

Removes mob effect from target.

Name	Type	Default Value	Description
effect	String		The mob effect to remove. Use 'all' to remove all mob effects from target.
target	Minecraft Filter	self	The target context to execute against.

run_command

JSON Object

Triggers a slash command or a list of slash commands.

Name	Type	Default Value	Description
command	String		Slash command to run.
command array	Array		List of slash commands to run.
target	Minecraft Filter	self	The target context to execute against.

set_block

JSON Object

Sets this block to another block type.

Name	Type	Default Value	Description
block_type	String		The type of block to set.

set_block_at_pos

JSON Object

Sets a block relative to this block to another block type.

Name	Type	Default Value	Description
block_offset	Vector [a, b, c]	[0.0, 0.0, 0.0]	The offset from the block's center.
block_type	String		The type of block to set.

set_block_state

JSON Object

Sets a block state on this block.

Name	Type	Default Value	Description
state	Molang		Block state to set on the block.

spawn_loot

JSON Object

Spawn loot from block.

Name	Type	Default Value	Description
table	String		File path, relative to the Behavior Pack's path, to the loot table file.

swing

JSON Object

Event causes the actor to swing.

teleport

JSON Object

Teleport target randomly around destination point.

Name	Type	Default Value	Description
avoid_water	Boolean	true	Determines if the teleport avoids putting the target in water.
destination	Vector [a, b, c]	[0.0, 0.0, 0.0]	Origin destination of the teleport.
land_on_block	Boolean	true	Determines if the teleport places the target on a block.
max_range	Vector [a, b, c]	[8.0, 8.0, 8.0]	Max range the target can teleport relative to the origin destination.
target	Minecraft Filter	self	The target context to execute against.

transform_item

JSON Object

Transforms item into another item.

Name	Type	Default Value	Description
transform	String		Name of the item it should transform into

Code Example

Event Response Example


    "minecraft:block": {
      "description": {
        "identifier": "test:on_interact_change_state_block",
        "properties": {
          "custom:direction": [0, 1, 2, 3]
        }
      },
      "components": {
        "minecraft:on_interact": {
          "event": "test_event"
        }
      },
      "events": {
        "test_event": {
          "set_block_state": {
            "custom:direction": "1"
          }
        }
      }
    }

Block Trigger Components

Name

Type

Default Value

Description

minecraft:on_fall_on

JSON Object