deleteService.ts

@Injectable()
export class UserService {
    
    constructor(private http: Http) { 
    }

    deleteUser(user:User): Observable<any>{
        return this.http.post("http://localhost:3000/deleteUser", { id: user._id })
        .map((res:any) => {
            return res.json();
        })
        .catch((error:any) => {
            return Observable.throw(error.json ? error.json().error : error || 'Server error')
        });
    }
}