---
title: "MessageData | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias MessageData

type MessageData \= {  
    [data](#data)?: [Serialized](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.Serialized/);  
    [error](#error)?: [Serialized](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.Serialized/) | null;  
    [id](#id): string;  
    [mustQueue](#mustqueue)?: boolean;  
    [origin](#origin): string;  
    [sourceMapId](#sourcemapid): string | number | null;  
    [targetMapId](#targetmapid)?: string | number | null;  
    [type](#type): [MessageType](https://docs.maptiler.com/sdk-js/api-reference/enums/MessageType/) | "<cancel>" | "<response>";  
}

##### Index

### Properties[](#properties)

[data?](#data) [error?](#error) [id](#id) [mustQueue?](#mustqueue) [origin](#origin) [sourceMapId](#sourcemapid) [targetMapId?](#targetmapid) [type](#type)

## Properties[](#properties-1)

### `Optional`data[](#data)

data?: [Serialized](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.Serialized/)

### `Optional`error[](#error)

error?: [Serialized](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.Serialized/) | null

### id[](#id)

id: string

### `Optional`mustQueue[](#mustqueue)

mustQueue?: boolean

### origin[](#origin)

origin: string

### sourceMapId[](#sourcemapid)

sourceMapId: string | number | null

### `Optional`targetMapId[](#targetmapid)

targetMapId?: string | number | null

### type[](#type)

type: [MessageType](https://docs.maptiler.com/sdk-js/api-reference/enums/MessageType/) | "<cancel>" | "<response>"