How to deal with the API response

Response Format

interface APIResponseCore {
    meta?: Record<string, any>;
    links?: ResponseLinksObject;
}

interface SuccessResponse<T> extends APIResponseCore {
    data: T
}

interface ErrorResponse extends APIResponseCore {
    errors: ResponseError[]
}

type APIResponse<T> = SuccessResponse<T> | ErrorResponse;

Example Code

const {
    data: contacts, 
    errors: list_contacts_errors
} = await fetch(
    list_contacts_url, 
    options
).then(r => r.json());

if (list_contacts_errors){
    throw list_contacts_errors;
}
for (let contact of contacts){
    // ...
}