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A simple example Drupal Controller with a cached JSON Response.
namespace Drupal\example\Controller;
use Symfony\Component\HttpFoundation\Request;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Cache\CacheableJsonResponse;
use Drupal\Core\Cache\CacheableMetadata;
class ExampleController extends ControllerBase {
public function getJson(Request $request) {
$data = [];
// Do some useful stuff to build an array of data.
// Add Cache settings for Max-age and URL context.
// You can use any of Drupal's contexts, tags, and time.
$data['#cache'] = [
'max-age' => 600,
'contexts' => [
$response = new CacheableJsonResponse($data);
return $response;
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