Using an Angular interface for an HTTP request: The statusText message reads as "Error: Unable to Determine."

I've been working on calling an API as an example in Angular using an interface. The API I'm trying to access is located at https://jsonplaceholder.typicode.com/posts.

Unfortunately, I encountered the following error message: ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: "Unknown Error", url: null, ok: false, ...}

Here's a snippet of my TypeScript code:

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { HttpClient } from '@angular/common/http';

interface Post {
  title: string;
  body: string;
};

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  constructor(public navCtrl: NavController, private http: HttpClient) {}

  ionViewDidLoad() {
    this.getData();
  }

  getData() {
    this.http.get<Post>('https://jsonplaceholder.typicode.com/posts').subscribe(res => {
      let postTitle = res.title;
      console.log(postTitle);
    });
  }
}

Answer №1

It appears that your code has a few issues, particularly with the type of 'res' being an Array. In order to access properties of objects within this array, you'll need to iterate through it using a loop (possibly something like this:)

let postTitle = [];
this.http.get<Post>('https://jsonplaceholder.typicode.com/posts').subscribe(res => {
  res.forEach(element => {
  postTitle.push(element);
});
  console.log(postTitle);
});

Additionally, I highly recommend calling APIs through a service rather than directly in a component.

Answer №2

After attempting to mimic this situation, I decided to use the following link: https://stackblitz.com/edit/angular-njzmwr

I encountered an issue where the current API is returning data as an array. This means you will need to either select the data from the array using a filter or find an alternative solution. Please review the URL provided above for more details.

Answer №3

When you call the API, it will give you an array of posts in response. Here's a sample code snippet to fetch and display the title of the first post:

fetchData() {
  this.http.get<Post[]>('https://jsonplaceholder.typicode.com/posts').subscribe(response => {
    let postTitle = response[0].title;
    console.log(postTitle);
  });
}

Hope this helps!

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