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📦 Custom Components

This page serves as an introduction to bridge.'s custom components which are available for use within your entity, block and item files. This article will cover the following topics:

☑️ What is a custom component?
☑️ How to install a custom component.
☑️ How to use a custom component.
☑️ How to write custom components.


Custom components allow you to extract common logic from entity, block and item files and to generate JSON using JavaScript or TypeScript. They integrate seamlessly into bridge. by appearing alongside Minecraft's built-in components within auto-completions.

Component Locations

Custom components are loaded from the components/ folder within your behavior pack.

  • Item components are expected to be within the components/item/ folder
  • Block components are expected to be within the components/block/ folder
  • Entity components are expected to be within the components/entity/ folder


If you do not feel confident in writing your own custom components, you can install pre-written components from bridge.'s extension store. Simply select the "components" tab within the sidebar and choose the component you need.


After installing or writing your first custom component, it will naturally appear within auto-completions within your entity, block and item files. You can then use the component as you would any other component.

Screenshot of a custom component being used within bridge.

Writing Custom Components

Start by creating a JavaScript or TypeScript file within the location described here. You can only write a single component per file which should be exported as the default export.

export default defineComponent(() => {...})


The call to defineComponent(...) is optional. It enables TypeScript to validate the passed component instantiation function.

name(componentName: string): void

Calling this function is required. It sets the name of the component which will be used within auto-completions.

export default defineComponent(({ name }) => {

schema(schemaDefinition: any): void

Use this function to set a JSON schema to validate the component's properties and provide auto-completions to your users.

export default defineComponent(({ schema }) => {
		type: 'object',
		properties: {
			my_property: {
				type: 'number',
				description: 'This is a custom component property',

template((componentProps: any, context: ITemplateContext) => void): void

Use this function to return a JSON template for the component. The created templates will be merged with the JSON file the component is used in. The componentProps parameter contains all properties defined within the current component's JSON file.

In the example below, the componentProps parameter has the value { "my_property": 42 }.

	"minecraft:entity": {
		"description": {
			"identifier": "bridge:my_entity"
		"components": {
			"bridge:my_component": {
				"my_property": 42
export default defineComponent(({ template }) => {
	template(({ my_property }, { create }) => {
				'minecraft:health': {
					max: my_property,
					value: my_property,

You can call create(...) to create a JSON template. The first argument is the JSON to create and the second argument is the path within the JSON file where the template should be created. Omitting the second argument will create the template at the root of the JSON file.

And that's it, you have just written your first basic custom component! 🎉

Released under the GPL-3.0 License.