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PLATFORM_INITIALIZER is Angular’s platform-level initialization token, but it has been deprecated since Angular 19.0. For platform setup, use providePlatformInitializer while creating the platform. If the work belongs to an individual application’s startup—and must finish before initialization completes—use provideAppInitializer instead.
What PLATFORM_INITIALIZER does
Angular runs platform initializers when it initializes the platform injector. A platform is the entry point for a page, and its injector is the parent injector for every Angular application on that page. That makes this API appropriate for work shared at the platform level, rather than setup belonging to just one application. See Angular’s PlatformRef documentation.
The legacy token is typed as InjectionToken<readonly (() => void)[]>. Angular marks PLATFORM_INITIALIZER deprecated since v19.0 and identifies providePlatformInitializer as its replacement. See the PLATFORM_INITIALIZER API reference.
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How to migrate to providePlatformInitializer
Replace the token-based registration with providePlatformInitializer, and register the callback in the platform creation configuration. Angular documents the helper as accepting an () => void callback and returning a StaticProvider. The callback runs in an injection context.
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import { providePlatformInitializer } from '@angular/core';
import { platformBrowser } from '@angular/platform-browser';
const platformRef = platformBrowser([
providePlatformInitializer(() => {
// Perform platform-level initialization.
}),
]);The key placement is the array passed to platformBrowser: the initializer is configured as the platform is created, not added to an individual app’s providers. Angular’s providePlatformInitializer API reference shows this pattern.
Choose the initializer by scope and completion behavior
| API | Scope and registration point | Completion behavior |
|---|---|---|
providePlatformInitializer |
Platform scope; register during platform creation. | Documented callback type is () => void. The API documentation does not describe waiting for an asynchronous result. |
provideAppInitializer |
Application scope; runs during application initialization. | Angular waits for a returned Promise to resolve or an Observable to complete before finishing application initialization. |
Use provideAppInitializer for app-start work such as loading language data or external configuration when startup needs to wait for that work. Its callback also runs in an injection context. Consult Angular’s provideAppInitializer API reference for its behavior and examples.
Do not substitute APP_INITIALIZER simply because it is another initializer token. It is application-level, not the direct replacement for PLATFORM_INITIALIZER; Angular deprecated it since v19.0 in favor of provideAppInitializer. See the APP_INITIALIZER API reference.
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