Bedrock Wiki
  • Discord
  • Contribute
  • bedrock.dev
  • MS Learn
Beginner's Guide
  • Guide
    • 1. Introduction
      guide
    • 2. Add-Ons Explained
    • 3. Software & Preparation
    • 4. Project Setup
    • 5. Create a Custom Item
    • 6. Create a Custom Entity
    • 7. Blockbench: Modeling, Texturing & Animating
    • 8. Adding a Loot Table, Spawn Rule & Crafting Recipe
  • Extra
    • a. Understanding JSON
    • b. Download Example Packs
    • c. Troubleshooting
      help
    • d. Advanced Manifest
    • e. Format Versions
    • f. Project Setup Android
Animation Controllers
  • Intro to Animation Controllers
    guide
  • Entity Commands
  • AFK Detector
  • Death Commands
  • Molang into Scoreboard
  • Respawn Commands
Blocks
  • General
    • Intro to Blocks
      guide
    • Block Components
    • Block Tags
    • Block States
    • Block Traits
    • Block Permutations
    • Block Events
      Scripts
    • Block Event Migration
      help
    • Blocks as Items
    • Troubleshooting Blocks
      help
  • Visuals
    • Block Culling
    • Block Models
      guide
    • Block Texture Animation
    • Block Texture Variation
    • Block Tinting
  • Tutorials
    • Applying Constant Effects
      Scripts
    • Avoiding State Limit
    • Fake Blocks
      Scripts
    • Ore Loot Tables
      Scripts
    • Precise Interaction
      Scripts
    • Precise Rotation
      Scripts
    • Rotatable Blocks
  • Vanilla Re-Creations
    • Custom Crops
      Scripts
    • Custom Glass
    • Custom Glazed Terracotta
    • Custom Trapdoors
      Scripts
  • Documentation
    • Block Format History
    • Block Shapes
    • Block Sounds
    • Vanilla Block Models
Commands
  • General
    • Intro to Command Blocks
    • Functions
    • Block States
    • Coordinate System
    • NBT Commands
    • Scoreboard Operations
    • Understanding Selectors
  • Commands
    • Damage
    • Execute
    • Playanimation
    • Playsound
  • On Event Systems
    • On Player First Join
    • On Player Join
    • On Player Leave
    • On Player Death
    • On Player Respawn
    • On First World Load
  • Scoreboard Systems
    • Entity Counter
    • Scoreboard Timers
    • Comparing And Retrieving Scores
  • Techniques
    • Execute Logic Gates
    • MBE - Max's Block Entity
    • FMBE - A New Way to Create Display Entities
    • Look Detection
    • Movement Detections
    • Orbital Camera
  • Useful Creations
    • Custom Crafter
    • Multiplayer Position Rearrangement
      function
Concepts
  • contents.json
  • Emojis & Symbols
  • Molang
  • Namespaces
  • Overwriting Assets
  • Raw Text
  • Shaders
  • Sounds
  • Subpacks
  • Text and Localization
  • Texture Atlases
  • textures_list.json
Documentation
  • Shared Constructs
  • Advanced Molang
  • File Types
  • Fog IDs
  • Material Configuration Description
  • Menu Categories
  • Molang Queries
  • Pack Folder Structure
  • Sound Definitions
  • Vanilla Materials
Entities
  • General
    • Intro to Entities BP
      guide
    • Intro to Entities RP
      guide
    • Troubleshooting Entities
      help
    • Entity Events
    • Entity Properties
    • NPC Dialogues
    • Render Controllers
    • Spawn Rules
  • Tutorials
    • Convert Points Between Any Space (World, Entity, Bones)
    • Creating Boats
    • Detecting Other Entities
    • Disabling Team Damage
    • Dummy Entities
    • Entity Attacks
    • Entity Holds Item
    • Entity Movement
    • Entity Timers
    • Flying Entities
    • Introduction to AOE Clouds
    • Invulnerable Entities
    • Look at Entity
    • Sleeping Entities
    • Solid Entities
    • Spawning Tamed Entities
      Scripts
    • Village Mechanic
  • Documentation
    • Dummy Components
    • Non-Mob Runtime Identifiers
    • Projectiles
    • Runtime Identifiers
    • Vanilla Usage Components
    • Vanilla Usage Spawn Rules
Items
  • General
    • Intro to Items
      guide
    • Item Components
    • Item Tags
    • Item Events
      Scripts
    • Item Event Migration
      help
    • Troubleshooting Items
      help
  • Tutorials
    • Custom Armor
    • Custom Food
      Scripts
    • Custom Pottery Sherds
    • Custom Weapons
    • Equipment-Based Commands
    • High Resolution Items
    • Spawning Items
    • Throwable Items
  • Documentation
    • Enchantments
    • Attachables
    • Item Format History
    • Numerical Item IDs
    • Vanilla Item Identifiers
    • Vanilla Usage Components
JSON UI
  • General
    • Intro to JSON UI
      guide
    • Best Practices
      guide
  • Tutorials
    • Adding HUD Elements
    • Aseprite Animations
    • Buttons and Toggles
    • Modifying Server Forms
    • Preserve Title Texts
    • String to Number
  • Documentation
    • JSON UI Documentation
Loot, Recipes & Trading
  • General
    • Trading Behavior
  • Documentation
    • Loot Tables
    • Trade Tables
    • Recipes
    • Item Functions
  • Tutorials
    • Randomized Structure Loot
Meta
  • Add-On Performance
  • Style Guide
  • Useful Links
  • Using Schemas
  • Version Control
  • Q&A
    • Blocks and Items Q&A 2024/08/30
    • Deferred Technical Preview Q&A 2024/02/23
    • GameTest Q&A 2021/08/06
    • Scripting and Editor Q&A 2023/09/22
    • World Generation Q&A 2024/11/15
NBT
  • General
    • .mcstructure
  • Tutorials
    • Experiments in Minecraft Education
    • Extending Structure Limits
  • NBT in Depth
    • About NBT (Named Binary Tag)
    • NBT Libraries
    • Reading NBT Example
Particles
  • General
    • Intro to Particles
      guide
  • Tutorials
    • Disabling Particles
  • Documentation
    • Vanilla Particles
Scripting
  • General
    • Intro to Scripting
    • What is Script API?
    • API Modules
  • Tutorials
    • Block Placement Prevention
    • GameTests
    • Script Core Features
    • Script Forms
    • Script Requests API
    • Simple Chat Commands
  • Documentation
    • Engine Environment
    • Script Resources
    • Script Watchdog
    • Troubleshooting JavaScript
    • TypeScript
Servers
  • Software
    • Bedrock Server Software
  • Protocols
    • Bedrock Protocol
    • NetherNet Protocol
    • RakNet Protocol
Visuals
  • General
    • Introduction to Entity Visuals
      guide
    • Bedrock Modeling
    • Custom Death Animations
    • Effects in Animations
    • Material Creations
    • Materials
    • Math-Based Animations
    • Skin Packs
  • Tutorials
    • Entity Texture Animation
    • Glowing Entity Texture
    • Hurt Animations
    • Leash Position
    • Player Geometry
    • Remove Entity Shadows
    • Retexturing Spawn Eggs
  • Ideas
    • Structure Presentation
World Generation
  • General
    • Intro to World Generation
      guide
    • Biomes
      guide
    • Feature Types
    • Jigsaw Structures
  • Tutorials
    • Block Conditions for Features
    • Generating Custom Ores
    • Generating Custom Structures
    • Generating Patches
    • Heightmap Noise
  • Documentation
    • Biome Tags

Block Event Migration

help
Block Event Migration
  • Add Mob Effect
  • Damage (Entities)
  • Damage (Items)
  • Decrement Stack
  • Die (Blocks)
  • Die (Entities)
  • Play Effect
  • Play Sound
  • Remove Mob Effect
  • Run Command
  • Set Block
  • Set Block at Pos
  • Set Block State
  • Spawn Loot
  • Teleport
  • Transform Item

BEFORE YOU START

This page requires you to be comfortable with basic JavaScript and requires knowledge of how modern block events work.

Struggling to upgrade your blocks' JSON events to custom components? Don't worry! This page will help you to understand what the deprecated JSON event responses look like implemented using the Script API.

Add Mob Effect ​

Custom Component
js
onStepOn({ entity }) {
    entity?.addEffect("regeneration", 30, {
        amplifier: 10,
        showParticles: false
    });
}
1
2
3
4
5
6

Damage (Entities) ​

js
import { EntityDamageCause } from "@minecraft/server";
1
Custom Component
js
onStepOn({ entity }) {
    entity?.applyDamage(2, {
        cause: EntityDamageCause.drowning
    });
}
1
2
3
4
5

Damage (Items) ​

js
import { EquipmentSlot, GameMode } from "@minecraft/server";
1
Custom Component
js
onPlayerInteract({ player }) {
    // Get main hand slot
    if (!player) return;

    const equippable = player.getComponent("minecraft:equippable");
    if (!equippable) return;

    const mainhand = equippable.getEquipmentSlot(EquipmentSlot.Mainhand);
    if (!mainhand.hasItem()) return;

    // Apply durability damage when not in creative mode
    if (player.getGameMode() === GameMode.creative) return;

    const itemStack = mainhand.getItem(); // Allows us to get item components

    const durability = itemStack.getComponent("minecraft:durability");
    if (!durability) return;

    // Factor in unbreaking enchantment
    const enchantable = itemStack.getComponent("minecraft:enchantable");
    const unbreakingLevel = enchantable?.getEnchantment("unbreaking")?.level;

    const damageChance = durability.getDamageChance(unbreakingLevel) / 100;

    if (Math.random() > damageChance) return; // Randomly skip damage based on unbreaking level

    // Damage the item
    const shouldBreak = durability.damage === durability.maxDurability;

    if (shouldBreak) {
        mainhand.setItem(undefined); // Remove the item
        player.playSound("random.break"); // Play break sound
    } else {
        durability.damage++; // Increase durability damage
        mainhand.setItem(itemStack); // Update item in main hand
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

Decrement Stack ​

js
import { EquipmentSlot, GameMode } from "@minecraft/server";
1
Custom Component
js
onPlayerInteract({ player }) {
    if (!player) return;

    const equippable = player.getComponent("minecraft:equippable");
    if (!equippable) return;

    const mainhand = equippable.getEquipmentSlot(EquipmentSlot.Mainhand);
    if (!mainhand.hasItem()) return;

    if (player.getGameMode() !== GameMode.creative) {
        if (mainhand.amount > 1) {
            mainhand.amount--; // Remove one item from the stack
        } else {
            mainhand.setItem(undefined); // Remove the item stack
        }
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

Die (Blocks) ​

Custom Component
js
onStepOn({ block }) {
    block.setType("minecraft:air");
}
1
2
3

Die (Entities) ​

Custom Component
js
onStepOn({ entity }) {
    entity?.kill();
}
1
2
3

Play Effect ​

Custom Component
js
onStepOn({ dimension, block }) {
    dimension.spawnParticle("minecraft:campfire_smoke_particle", block.center());
}
1
2
3

Play Sound ​

Custom Component
js
onStepOn({ dimension, block }) {
    dimension.playSound("dig.stone", block.center());
}
1
2
3

Remove Mob Effect ​

Custom Component
js
onStepOn({ entity }) {
    entity?.removeEffect("regeneration");
}
1
2
3

Run Command ​

Custom Component
js
onStepOn({ dimension }) {
    dimension.runCommand("say Hello there!");
    dimension.runCommand("say Welcome to my world!");
}
1
2
3
4

Set Block ​

Custom Component
js
onStepOn({ block }) {
    block.setType("minecraft:grass_block");
}
1
2
3
js
import { BlockPermutation } from "@minecraft/server";
1
Custom Component
js
onStepOn({ block }) {
    block.setPermutation(BlockPermutation.resolve("minecraft:campfire", {
        "minecraft:cardinal_direction": "east",
        "extinguished": true
    }));
}
1
2
3
4
5
6

Set Block at Pos ​

Custom Component
js
onStepOn({ dimension, block }) {
    const offset = { x: -1, y: 1, z: 5 };

    const locationWithOffset = {
        x: block.location.x + offset.x,
        y: block.location.y + offset.y,
        z: block.location.z + offset.z
    };

    dimension.setBlockType(locationWithOffset, "minecraft:grass_block");
}
1
2
3
4
5
6
7
8
9
10
11
js
import { BlockPermutation } from "@minecraft/server";
1
Custom Component
js
onStepOn({ dimension, block }) {
    const offset = { x: -1, y: 1, z: 5 };

    const locationWithOffset = {
        x: block.location.x + offset.x,
        y: block.location.y + offset.y,
        z: block.location.z + offset.z
    };

    dimension.setBlockPermutation(locationWithOffset, BlockPermutation.resolve("minecraft:campfire", {
        "minecraft:cardinal_direction": "east",
        "extinguished": true
    }));
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14

Set Block State ​

Custom Component
js
onStepOn({ block }) {
    block.setPermutation(
        block.permutation.withState("wiki:integer_example", 5)
    );
}
1
2
3
4
5
js
import { BlockPermutation } from "@minecraft/server";
1
Custom Component
js
onStepOn({ block }) {
    const states = {
        ...block.permutation.getAllStates(),
        "wiki:boolean_example": false,
        "wiki:integer_example": 5,
        "wiki:string_example": "blue"
    };

    block.setPermutation(
        BlockPermutation.resolve(block.typeId, states)
    );
}
1
2
3
4
5
6
7
8
9
10
11
12

Spawn Loot ​

js
import { ItemStack } from "@minecraft/server";
1
Custom Component
js
onStepOn({ dimension, block }) {
    dimension.spawnItem(new ItemStack("minecraft:stick", 3), block.center());
}
1
2
3
Custom Component
js
onStepOn({ dimension, block }) {
    const { x, y, z } = block.center();

    dimension.runCommand(`loot spawn ${x} ${y} ${z} loot "entities/ghast"`);
}
1
2
3
4
5

Teleport ​

Custom Component
js
onStepOn({ entity }) {
    entity?.teleport({ x: 100, y: 20, z: 786 });
}
1
2
3

Transform Item ​

js
import { EquipmentSlot, ItemStack } from "@minecraft/server";
1
Custom Component
js
onPlayerInteract({ player }) {
    const equippable = player?.getComponent("minecraft:equippable");
    if (!equippable) return;

    const mainhand = equippable.getEquipmentSlot(EquipmentSlot.Mainhand);
    if (!mainhand.hasItem() || mainhand.typeId !== "minecraft:bowl") return;

    mainhand.setItem(new ItemStack("minecraft:suspicious_stew"));
}
1
2
3
4
5
6
7
8
9

Contributors

Edit Block Event Migration on GitHub

Text and image content on this page is licensed under the Creative Commons Attribution 4.0 International License

Code samples on this page are licensed under the MIT License

Bedrock Wiki by Bedrock OSS

"Minecraft" is a trademark of Mojang AB.

Bedrock OSS, Bedrock Wiki and bedrock.dev are not affiliated in any way with Microsoft or Mojang AB.

  • Privacy Policy
  • Join our Discord
  • Learn how to Contribute
  • Visit our Repository