code: public function execute()
      {
          $result = $this->resultJson->create();
  
          try {
              $activeVersion = $this->getRequest()->getParam('active_version');
              $dictionary = $this->api->getSingleDictionary($activeVersion, 'magentomodule_basic_auth');
  
              // Fetch Authentication items
              if (!$dictionary || (is_array($dictionary) && empty($dictionary))) {
                  return $result->setData([
                      'status'    => 'none',
                      'msg'       => 'Authentication dictionary does not exist.'
                  ]);
              }
  
              $authItems = false;
  
              if (isset($dictionary->id)) {
                  $authItems = $this->api->dictionaryItemsList($dictionary->id);
              }
  
              if (is_array($authItems) && empty($authItems)) {
                  return $result->setData([
                      'status'    => 'empty',
                      'msg'       => 'There are no dictionary items.'
                  ]);
              }
  
              if (!$authItems) {
                  return $result->setData([
                      'status'    => false,
                      'msg'       => 'Failed to fetch dictionary items.'
                  ]);
              }
  
              foreach ($authItems as $key => $item) {
                  $userData = explode(':', base64_decode($item->item_key)); // @codingStandardsIgnoreLine - used for authentication
                  $username = $userData[0];
                  $item->item_key_id = $item->item_key;
                  $item->item_key = $username;
                  $authItems[$key] = $item;
              }
  
              return $result->setData([
                  'status'    => true,
                  'auths'     => $authItems
              ]);
          } catch (\Exception $e) {
              return $result->setData([
                  'status'    => false,
                  'msg'       => $e->getMessage()
              ]);
          }
      }
docs: Get all Auth items for active version
  
  @return $this|\Magento\Framework\App\ResponseInterface|\Magento\Framework\Controller\ResultInterface