Dealing with a problem in Angular 6's HttpClient when trying to map the response received from

Can anyone assist me with a minor issue I'm facing related to Angular 6 HttpClient? I seem to be encountering an obstacle with the response from my REST API calls. Utilizing HttpClient, I have a function that retrieves a list of all users (referred to as leads in my case).

fetchLeadsList(){
  return this.http.get('http://localhost:3000/api/leads')
                  .pipe(
                     map(data => {
                        console.log(data);
                        return data;          
                     }));
}

Within the OnInit of my component, I invoke this endpoint like so:

this.leadsService.fetchLeadsList()
                 .subscribe(response => {
                    console.log(response, 'leadsList');
                    this.leadsList = response.data; // leadList is an empty array 
                 });

The list of leads appears as follows: https://i.sstatic.net/Sb1Dy.png

However, when trying to extract the response data within the component as mentioned above (this.leadsList = response.data), I encounter the following error:

ERROR TS2339: Property 'data' does not exist on type 'Object'.

Considering that the image shows the presence of the data property, why am I receiving this error?

In addition, I can successfully display the list in the view! Is there something crucial that I might be overlooking?

Answer №1

To ensure smooth compilation, specify the type of response to the compiler. You have the option to define a custom type for it or simply assign it as any to allow the compiler to process your code without errors.

this.leadsService.retrieveLeadsData()
    .subscribe((response: any) => {
      console.log(response, 'leadsList');
      this.leadsList = response.data; // leadList is initialized as an empty array
})

Answer №2

When utilizing the HttpClient.get() method, the JSON server response is transformed into an anonymous Object type, with its shape unknown.

If you want to specify a particular model for casting the result:

fetchLeadsList() {
    return this.http.get<{ data: any[] }>('http://localhost:3000/api/leads')
                         ^^^^^^^^^^^^^

For more information, check out:

Answer №3

Give it a shot using response['data'] and hopefully that will provide the solution you need

Keep coding with joy :)

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