PLATFORM_INITIALIZER is Angular’s deprecated platform-level initialization token. Since Angular 19, use providePlatformInitializer for platform setup; use provideAppInitializer when initialization belongs to an individual application. The distinction matters because the APIs run at different injector scopes, and only the app initializer is documented to wait for a returned Promise or Observable.
What PLATFORM_INITIALIZER does
PLATFORM_INITIALIZER represents callbacks that run when Angular initializes the platform injector. Angular describes the platform as the entry point for a page; its injector is the parent injector for every Angular application on that page. That makes this token appropriate for work associated with the platform rather than setup belonging to one application. See Angular’s PLATFORM_INITIALIZER API and PlatformRef API.
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The token’s documented type is InjectionToken<readonly (() => void)[]>. Angular marks it deprecated since v19.0 and names providePlatformInitializer as its replacement.
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Replace a PLATFORM_INITIALIZER registration with providePlatformInitializer, and register the helper as part of platform creation. Angular documents the helper as a () => void callback that runs in an injection context.
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import { providePlatformInitializer } from '@angular/core';
import { platformBrowser } from '@angular/platform-browser';
const platformRef = platformBrowser([
providePlatformInitializer(() => {
// Platform-level setup
}),
]);This follows Angular’s documented registration point: the initializer is passed to platformBrowser([...]) while creating the platform. The resulting platform reference can then be used to bootstrap an application. Consult the providePlatformInitializer API for the current signature and example.
Choose the initializer by scope
| API | Scope and registration | Completion behavior |
|---|---|---|
providePlatformInitializer |
Platform injector; register during platform creation. | Documented callback type is () => void; the API documentation does not describe waiting for an asynchronous result. |
provideAppInitializer |
Application startup; provide it in application providers. | If the callback returns a Promise or Observable, Angular waits for it to resolve or complete before finishing application initialization. |
Use the app-level helper for tasks such as loading language data or external configuration needed by a particular application. Angular marks the older APP_INITIALIZER token deprecated since v19.0 in favor of provideAppInitializer; it is not the direct replacement for platform initialization. See provideAppInitializer and APP_INITIALIZER.
Does a platform initializer wait for asynchronous work?
Do not treat providePlatformInitializer as an asynchronous startup barrier based on its documented API. Angular specifies a void-returning callback and does not document awaiting a Promise or Observable for this helper. If application startup must wait for asynchronous work, use provideAppInitializer and return the Promise or Observable from its callback.
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