Loop through JSON results in Ionic using Angular

I am struggling to retrieve data from a JSON file in Object format using Typescript. When I try to fetch the data from the API, it doesn't display as expected.

Typescript

this.http.get('http://example.com/api')
  .subscribe((data) => {
    console.log(data);
  });

The structure of the API JSON file is as follows:

{
  1: {id:1, name: "string"}
  2: {id:1, name: "string"}
  3: {id:1, name: "string"}
  4: {id:1, name: "string"}
}

I need help with looping through this data later on.

<ion-item *ngFor="let item of data" >
  <div>
    {{item.name}}
  </div>
</ion-item>

Any assistance would be greatly appreciated.

I found a solution to my issue:

<ion-item *ngFor="let item of data | keyvalue" >
  <div>
    {{ item.key }} {{ item.value['data'] }}
  </div>
</ion-item>

Answer №1

There are various ways to iterate through this response object:

  1. utilize the keyvalue pipe from angular: *ngFor item of data | keyvalue
  2. transform it into an array using Object.values(data) or Object.entries(data). The former provides only the value object, while the latter includes both the values and the "numbers"

It is important to note that the order of the returned object is not defined. Therefore, if you choose either method, the sequence of iteration may be unpredictable and could be random.

While it might work correctly on your specific device/browser, it is unwise to depend on it. It's advisable to sort your data post-conversion to an array if ordering is essential.

If the order is determined by the numeric keys in the original object, using Object.entries would be a suitable approach as it produces an array of key-value pairs

[[1, {id:1, name: "string"}], [...], ...]

You can then easily arrange them based on the first element of each pair.

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