Angular 17 uses stand alone component no more module

HTTP provider not included

Standalone 17+ no longer auto-include HTTP providers.

You must explicitly register them with provideHttpClient() (or import the old module).

Without that, any constructor injection of HttpClient (or its alias _HTTPClient) fails with

NullInjectorError: No provider for _HTTPClient!

Router not included in standalone

When you go fully-standalone in Angular, the router isn’t automatically wired up for you the way it used to be in an NgModule. You need two things:

1. Provide your routes at bootstrap

2. Import the router directives (RouterOutlet, RouterLink, etc.) into your root (and any other) components