For Json:

{
      "employees":[
      {"firstName":"John", "lastName":"Doe"},
      {"firstName":"Anna", "lastName":"Smith"},
      {"firstName":"Peter", "lastName":"Jones"}
      ]
      }

Data Classes are:

• EmployeesData

  
              <php 
  namespace App\Data\Employees;
  use Spatie\LaravelData\Data;
  use Spatie\LaravelData\Attributes\DataCollectionOf;
  use Spatie\LaravelData\DataCollection;
  class EmployeesData extends Data
  {
   public function __construct(
  /** @var DatCollection */
  #[DataCollectionOf(Employees_employeesData::class)]
  public DataCollection $employees,
  ) {}
  }
            

• Employees_employeesData

  
  <?php 
  namespace App\Data\Employees;
  use Spatie\LaravelData\Data;
  class Employees_employeesData extends Data
  {
   public function __construct(
  public ?string $firstName = null,
  public ?string $lastName = null,
  ) {}
  }
            

Usage:

      
      use App\Data\Employees\EmployeesData;
      $employeesJson = '{
      "employees":[
      {"firstName":"John", "lastName":"Doe"},
      {"firstName":"Anna", "lastName":"Smith"},
      {"firstName":"Peter", "lastName":"Jones"}
      ]
      }';      
      /*Json to Laravel data classes */
      $employeesData = EmployeesData::from(json_decode($employeesJson));
      /*Again convert to Json*/
      $sameJson = $employeesData->toJson();