how to get data from api using angular ionic

I have api get data from api.

this.http.get(`${this.apiUrl}`);
getData(): Observable<any> {
return this.http.get(`${this.apiUrl}`);
}
postData(data: any): Observable<any> {
const headers = new HttpHeaders({
'Content-Type': 'application/json',
});
return this.http.post(`${this.apiUrl}/add`, data, { headers });
}
deleteData(query:any): Observable<any> {
return this.http.delete(`${this.apiUrl}/${query}`);
}
updateData(query:any,data:any): Observable<any> {
return this.http.put(`${this.apiUrl}/${query}`, data);
}

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