Angular Standalone: NullInjectorError: No provider for _HttpClient

Find my service class code.

You are missing using provideHttpClient().

In Angular standalone application, configure HttpClient using provideHttpClient() as below.

//app.config.ts

export const appConfig: ApplicationConfig = {
  providers: [
    provideHttpClient(),
    ------
  ]
};


//main.ts

bootstrapApplication(AppComponent, appConfig)
  .catch((err) => console.error(err));