'textfield', '#title' => 'Content', ]; $form['status'] = [ '#type' => 'textfield', '#title' => 'Status', '#default_value' => 200, ]; $form['submit'] = [ '#type' => 'submit', '#value' => 'Submit', ]; return $form; } /** * {@inheritdoc} */ public function submitForm(array &$form, FormStateInterface $form_state) { $values = $form_state->getValues(); $form_state->setResponse(new JsonResponse($values['content'], (int) $values['status'])); } }