for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
<?php
declare(strict_types=1);
namespace Yiisoft\Validator\Rule\Json;
use Yiisoft\Validator\Result;
use Yiisoft\Validator\Rule\RuleValidatorInterface;
use Yiisoft\Validator\ValidationContext;
use Yiisoft\Validator\ValidatorInterface;
use function is_string;
/**
* Validates that the value is a valid json.
*/
final class JsonValidator implements RuleValidatorInterface
{
public function validate(mixed $value, object $rule, ValidatorInterface $validator, ?ValidationContext $context = null): Result
$result = new Result();
if (!$this->isValidJson($value)) {
$result->addError($rule->message);
}
return $result;
private function isValidJson($value): bool
// Regular expression is built based on JSON grammar specified at
// https://tools.ietf.org/html/rfc8259
$regex = <<<'REGEX'
/
(?(DEFINE)
(?<json>(?>\s*(?&object)\s*|\s*(?&array)\s*))
(?<object>(?>\{\s*(?>(?&member)(?>\s*,\s*(?&member))*)?\s*\}))
(?<member>(?>(?&string)\s*:\s*(?&value)))
(?<array>(?>\[\s*(?>(?&value)(?>\s*,\s*(?&value))*)?\s*\]))
(?<value>(?>)false|null|true|(?&object)|(?&array)|(?&number)|(?&string))
(?<number>(?>-?(?>0|[1-9]\d*)(?>\.\d+)?(?>[eE][-+]?\d+)?))
(?<string>(?>"(?>\\(?>["\\\/bfnrt]|u[a-fA-F0-9]{4})|[^"\\\0-\x1F\x7F]+)*"))
)
\A(?&json)\z
/x
REGEX;
return is_string($value) && preg_match($regex, $value) === 1;
yiisoft /
validator
