Data.php

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<?php
namespace Magento\Framework\Json\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $jsonDecoder;

    protected $jsonEncoder;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\Json\DecoderInterface $jsonDecoder,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder
    ) {
        parent::__construct($context);
        $this->jsonDecoder = $jsonDecoder;
        $this->jsonEncoder = $jsonEncoder;
    }

    public function jsonEncode($valueToEncode)
    {
        return $this->jsonEncoder->encode($valueToEncode);
    }

    public function jsonDecode($encodedValue)
    {
        return $this->jsonDecoder->decode($encodedValue);
    }
}