"Obtaining data from a JSON response: A step-by-step

After receiving a JSON result, which contains only one array as shown below:

{
  id: "5", 
  client: "8", 
}
id: 5
client: 8

I am trying to access it using the following function:

getClient(url: string){
  this.clientService.client(this.clientUrl).subscribe((info: ClientInfo[]) => {
    console.log(info);
    console.log(info[0].id);
  });
}

To retrieve the data within `.client`, I have created the public method as follows:

public client(url: string): Observable<ClientInfo[]> {
    return this.httpClient.get<ClientInfo[]>(url);
}

The structure of the array being used is defined in the `ClientInfo` class:

export class ClientInfo{
   id: number;
   client: number;
}

Despite working with a single array, an error 'cannot get id of undefined' has been encountered. Is there any way to access the id value from this array? I've already attempted to use `info.id` but without success.

Answer №1

When there is only one result instead of several, it is likely that your backend will provide a different answer.

To access your object in the meantime, you can use the following code:

const item: ClientInfo = info.length ? item[0] : item;

Using this approach will guarantee that you retrieve either the first result or the only result available.

Answer №2

Simply retrieve the information from your example by using info.id.

If the data is stored in an array, you have another option. Here's how the input should be formatted:

let infoArray = [
  {
    id: "5",
    client: "8"
  }
];
infoArray[0].id;   // "5"

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