firefly-iii/app/JsonApi/V3/Users/UserResource.php

<?php

namespace FireflyIII\JsonApi\V3\Users;

use FireflyIII\Models\User;
use Illuminate\Http\Request;
use LaravelJsonApi\Core\Resources\JsonApiResource;

/**
 * @property User $resource
 */
class UserResource extends JsonApiResource
{

    /**
     * Get the resource's attributes.
     *
     * @param Request|null $request
     * @return iterable
     */
    public function attributes($request): iterable
    {
        return [
            'created_at' => $this->resource->created_at,
            'updated_at' => $this->resource->updated_at,
            'email'      => $this->resource->email,
        ];
    }

    /**
     * Get the resource's relationships.
     *
     * @param Request|null $request
     * @return iterable
     */
    public function relationships($request): iterable
    {
        return [
            // @TODO
        ];
    }

}