the data variable is of object type and not an array, so when you assign it to return this.posts = data, this.posts now becomes an object. You can do the following to make it into an array

this.posts = []
for(let key in data){
    this.posts.push(data[key])
}
return this.posts

Replace your HTML with this:

<ion-list>
  <ion-item *ngFor = "let post of posts | keyvalue" >
    <ion-thumbnail>
        <img src="http://127.0.0.1:8000/storage/{{ post.value.image }}" alt="have error" >
    </ion-thumbnail>    
    <ion-label>{{ post.value.title }}</ion-label>
    <p></p>
  </ion-item>
</ion-list>

That’s it!

i work in inoic 5 / angularjs project this app get data from api and display it

(1) this function to get data from api :

getProdects(){
    this.categoryId   = this.activatedroute.snapshot.params["id"];
    console.log(this.categoryId);   
  this.presentLoading();
  this.apiservice.getdate("posts/cat/5").subscribe(data => {
     //this.posts = JSON.parse(data.data);
     console.log(data);
     this.loadingController.dismiss();
      return this.posts = data;
  })}

(1) and this html code :

<ion-list>
  <ion-item *ngFor = "let post of posts" >
    <ion-thumbnail>
        <img src="http://127.0.0.1:8000/storage/{{ post.image }}" alt="have error" >
    </ion-thumbnail>    
    <ion-label>{{ post.title }}</ion-label>
    <p></p>
  </ion-item>
</ion-list>

display this error in browser:

ERROR Error: Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.

and array show like this :

{2: {…}, 3: {…}, 4: {…}}

2: {id: 4, title: "ثلاجة الجي 14 قدم", body: "ثلاجة علوية 14 قدم مكعب رمادي داكن", image: "images/KZbWKFnJgFR4njb97kZSblwa96zv367yUqXAttx9.jpeg", image2: "images/xbuSDXSq0XUCnPuZKTREJRr7Fkay6nMAnKpRuxcw.jpeg", …}

3: {id: 5, title: "ثلاجة توشيبا سعة 355 لتر", body: "ثلاجة توشيبا نوفروست سعة 355 لتر ، 2 باب لون سيلفر مزودة بيد دائرية", image: "images/ID4A1mK42KxSie6uZRkdMhmSXkOXy2uj7XkWJinm.jpeg", image2: "images/HEtOn8gqx60bfbpxR2i6qVNTHaLJtn7UfgiEtU53.jpeg", …}

4: {id: 6, title: "ثلاجة سامسوج بابين", body: "ثلاجة سامسوج بابين - نوفورست سيلفر", image: "images/U3ONmUmq8S3kMJZ4VgmVLWLOBAFlWugOkew7Ndx3.jpeg", image2: "images/NDGQLs0S1GNZlZkO8ZYIoW5034KXtctPRbuBJLen.jpeg", …}
__proto__: Object