Angular: NG0201: No provider for X found in NodeInjector

Meaning

Unlike the older NullInjectorError, this message comes from the element injector (a component, directive or pipe). Provide the service with providedIn: 'root', in the component's providers, or in the route/bootstrap providers.

Common causes

• Service lacks @Injectable({ providedIn: 'root' }) and is not in any providers
• Provider declared in a lazy-loaded module/route not covering this component
• A directive/pipe injecting a token that must be provided by its host (for example NgControl)
• Parent-only token injected with the wrong @Host/@Optional flags
• Test module without the required provider

Detailed fix by platform

Code examples

@Component({
  selector: 'app-cart',
  standalone: true,
  providers: [CartService],           // component-level instance
  template: `...`,
})
export class CartComponent { cart = inject(CartService); }

How to diagnose

1. Token — Which service or token is named?
2. Provider — Where is it provided?
3. Tree — Is the component inside that provider's scope?

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