angular load json file with httpclient

1import { HttpClient } from '@angular/common/http'; 
2import { Observable } from 'rxjs';
3
4@Injectable()
5export class AppSettingsService {
6
7   constructor(private http: HttpClient) {
8        this.getJSON().subscribe(data => {
9            console.log(data);
10        });
11    }
12
13    public getJSON(): Observable<any> {
14        return this.http.get("./assets/mydata.json");
15    }
16}
17