JsonValidator.php

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<?php
namespace Magento\Framework\Serialize;

class JsonValidator
{
    public function isValid($string)
    {
        if ($string !== false && $string !== null && $string !== '') {
            json_decode($string);
            if (json_last_error() === JSON_ERROR_NONE) {
                return true;
            }
        }
        return false;
    }
}