Answers for "NullInjectorError: R3InjectorError HttpClient"

NullInjectorError: No provider for HttpClient!

@NgModule({
...
imports:[ HttpClientModule ]
...
})

NullInjectorError: R3InjectorError HttpClient

// missing import on app.module.ts

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
  	HttpClientModule
  ]