ngFor is not showing the items in html? Angular 2/4

Question

This is really bothering me. I'm trying to display an array in angular 2/4. I think there's a mistake in Angular. the html, service, or component part, because my node back end works as it should. My html looks like this.

<div class = "container">

<li *ngFor = "let customer of customers">
    <div class = "col md-6">
            {{ customer.firstName }}
    </div>
</li>
<div *ngFor = "let customer of customers">
    <div class = "col md-6">
            {{ customer.lastName }}
    </div>
</div>

My service is this

@Injectable()
export class CustomerService {

constructor(private http: Http) { }

//retreiving custmers
getCustomers(){
    return this.http.get('http://localhost:3001/api/customers')
    .map(res => res.json());
}
}

My component is this

export class CustomersComponent implements OnInit {

customers: Customer[];
customer: Customer;
firstName: string;
lastName: string;

//initialize customer service   
constructor(private customerService: CustomerService) { }

//initiated once component is loaded
ngOnInit() {

this.customerService.getCustomers()
    .subscribe( customer => 
        this.customer = customer);


 }

Answer 1

You have a typo , change customer to be customers

this.customerService.getCustomers()
    .subscribe( customers => {

        this.customers = customers

      });

 }