JsonViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Format;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It originated from the Neos.Form package (www.neos.io)
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithContentArgumentAndRenderStatic;

class JsonViewHelper extends AbstractViewHelper
{
    use CompileWithContentArgumentAndRenderStatic;

    protected $escapeChildren = false;

    public function initializeArguments()
    {
        $this->registerArgument('value', 'mixed', 'The incoming data to convert, or null if VH children should be used');
        $this->registerArgument('forceObject', 'bool', 'Outputs an JSON object rather than an array', false, false);
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $value = $renderChildrenClosure();
        $options = JSON_HEX_TAG;
        if ($arguments['forceObject'] !== false) {
            $options = $options | JSON_FORCE_OBJECT;
        }
        return json_encode($value, $options);
    }
}