SerializedToJson.php

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<?php
namespace Magento\Framework\DB\DataConverter;

use Magento\Framework\Serialize\Serializer\Json;
use Magento\Framework\Serialize\Serializer\Serialize;

class SerializedToJson implements DataConverterInterface
{
    private $serialize;

    private $json;

    public function __construct(
        Serialize $serialize,
        Json $json
    ) {
        $this->serialize = $serialize;
        $this->json = $json;
    }

    public function convert($value)
    {
        if ($this->isValidJsonValue($value)) {
            return $value;
        }
        return $this->encodeJson($this->unserializeValue($value));
    }

    protected function isValidJsonValue($value)
    {
        if (in_array($value, ['null', 'false', '0', '""', '[]'])
            || (json_decode($value) !== null && json_last_error() === JSON_ERROR_NONE)
        ) {
            return true;
        }
        //JSON last error reset
        json_encode([]);
        return false;
    }

    protected function unserializeValue($value)
    {
        try {
            set_error_handler(function ($errorNumber, $errorString) {
                throw new DataConversionException($errorString, $errorNumber);
            });
            $value = $this->serialize->unserialize($value);
        } catch (\Throwable $throwable) {
            throw new DataConversionException($throwable->getMessage());
        } finally {
            restore_error_handler();
        }
        return $value;
    }

    protected function encodeJson($value)
    {
        $storedPrecision = ini_get('precision');
        $storedSerializePrecision = ini_get('serialize_precision');

        if (PHP_VERSION_ID < 70100) {
            // In PHP version < 7.1.0 json_encode() uses EG(precision).
            ini_set('precision', 17);
        } else {
            // In PHP version >= 7.1.0 json_encode() uses PG(serialize_precision).
            ini_set('serialize_precision', 17);
        }

        $value = $this->json->serialize($value);

        ini_set('precision', $storedPrecision);
        ini_set('serialize_precision', $storedSerializePrecision);

        if (json_last_error()) {
            throw new DataConversionException(json_last_error_msg());
        }
        return $value;
    }
}