How can I handle errors in Angular route resolvers?

How can I handle errors in Angular route resolvers?

You can handle errors in Angular route resolvers by using the resolve property in your route configuration. You can return an observable or a promise that can catch errors.

Can you show me an example of that?

Sure! Here's a simple example:

const routes: Routes = [
  {
    path: 'data',
    resolve: {
      data: DataResolver
    }
  }
];

@Injectable({ providedIn: 'root' })
export class DataResolver implements Resolve<Data> {
  constructor(private dataService: DataService) {}

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Data> {
    return this.dataService.getData().pipe(
      catchError((error) => {
        console.error('Error fetching data', error);
        return of(null); // or handle the error as needed
      })
    );
  }
}

This way, if there's an error, you can handle it gracefully.

What happens if the resolver returns null?

If the resolver returns null, the route will still activate, but you may want to handle this case in your component to show an appropriate message or redirect the user.