filter with angular search bar

I am trying to do a search with a bar, in which the names of all the clients that are registered in the bd appear. From a php file I made the query. This is my code ts:

userData:any={"accion":"consultaclientes"};
 initializeItems() {
        this.restprovider.Registro(this.userData).then((result) => {
          this.data = result;
          console.log(this.data);
          this.clientes=this.data;
        }, (err) => {
          this.presentToast(err);
        });
      }
 getItems(ev) {
    // Reset items back to all of the items
    this.initializeItems();

    // set val to the value of the ev target
    var val = ev.target.value;

    // if the value is an empty string don't filter the items

 if (val && val.trim() != '') {
  this.clientes.nombre = this.clientes.nombre.filter((item) => {
    return (item.toLowerCase().indexOf(val.toLowerCase()) > -1);
  })
    }
  }

This my html code:

 <ion-searchbar (ionInput)="getItems($event)"></ion-searchbar>
  <ion-list>
    <ion-item *ngFor="let item of items">
      {{ item }}
    </ion-item>