# load(libraryNames) Tells MapKit JS which libraries to load. ``` load?(libraryNames: string | string[]): Promise; ``` ## Parameters `libraryNames` The libraries to load. ## Return Value A promise that resolves when the libraries finish loading. The promise resolves to the [`mapkit`](/documentation/MapKitJS/mapkit) namespace object. ## Discussion > Note: > The full bundle of MapKit JS doesn’t implement this method. This method returns a `Promise` that resolves when the requested libraries finish loading. The promise resolves to the [`mapkit`](/documentation/MapKitJS/mapkit) namespace object, allowing you to destructure the interfaces you need directly from the result: ```javascript const { Map } = await mapkit.load(["map"]); ``` MapKit JS also dispatches either a `load` event or a `load-error` event when the libraries finish loading. The event ([`MapKitLibraryLoadEvent`](/documentation/MapKitJS/MapKitLibraryLoadEvent)) contains the array of library names that you pass to this method. If the libraries fail to load, the returned promise rejects. Calling `load()` with libraries that are already loaded is a no-op; the promise resolves immediately. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)