Validating with Service call on typing text - Angular

comp.ts

    searchSubject = new Subject();
    searchResult$: Observable<any>;



        this.searchResult$ = this.searchSubject.pipe(
            debounceTime(1000),
            distinctUntilChanged(),
            switchMap((searchText: string) => {
                return this.service.validateZipCode(searchText)
            }),
            map((res: any) => {
                return { ...res }
            })
        );

        this.searchResult$.subscribe(
            data => {
                console.warn('subscribe', data);
                if (data.hasOwnProperty('errorMessage')) {
                    this.setAddressFormErrored(data.errorMessage);
                } else {
                    this.setAddressFormErrored('');
                    this.userData.city = data.city;
                    this.userData.state = data.state;
                    this.validateStateAfterResponse(data.state);
                }
            });