How to use Angular services
Łukasz Holeczek
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Using Angular services is fundamental for sharing data, implementing business logic, and handling API communication across components in Angular applications.
As the creator of CoreUI, a widely used open-source UI library, I’ve implemented countless Angular services for data management over 25 years of development.
From my expertise, the most effective approach is creating injectable services with the @Injectable decorator and injecting them into components through dependency injection.
This promotes separation of concerns and code reusability.
Create services with @Injectable decorator and inject them into components.
@Injectable({ providedIn: 'root' })
export class DataService {
getData() {
return 'Service data'
}
}
// In component
constructor(private dataService: DataService) {}
Here the @Injectable decorator with providedIn: 'root' makes the service available application-wide as a singleton. Components inject the service through their constructor using dependency injection. The private modifier creates a class property that can be used throughout the component to access service methods and properties.
Best Practice Note:
This is the same service architecture we use in CoreUI Angular components for data management and API communication. Keep services focused on specific responsibilities and use interfaces to define service contracts for better type safety and testing.
