An example of Magento 2 backend controller with JSON response:
<?php
namespace Dfe\Login\Controller\Adminhtml\DfeLogin;
class Google extends \Magento\Backend\App\AbstractAction {
/**
* @param \Magento\Backend\App\Action\Context $context
* @param \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
*/
public function __construct(
\Magento\Backend\App\Action\Context $context
,\Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
) {
parent::__construct($context);
$this->resultJsonFactory = $resultJsonFactory;
}
/**
* @return \Magento\Framework\Controller\Result\Json
*/
public function execute() {
/** @var \Magento\Framework\Controller\Result\Json $result */
$result = $this->resultJsonFactory->create();
return $result->setData(['success' => true]);
}
}
etc/adminhtml/routes.xml:
<?xml version='1.0'?>
<config xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='../../../../../../lib/internal/Magento/Framework/App/etc/routes.xsd'>
<router id='admin'>
<route id='adminhtml' frontName='admin'>
<module name='Dfe_Login' before='Magento_Backend' />
</route>
</router>
</config>