src/Factories/Factory.php
public function createValidator(
        array $data,
        array $rules,
        array $messages = [],
        array $customAttributes = [],
        \Closure $callback = null
    ): ValidatorInterface
    {
        $translator = $this->createErrorTranslator();

        return new Validation\Validator(
            $this->makeValidator($data, $rules, $messages, $customAttributes),
            $translator,
            $callback
        );
    }
public function createValidator(
        array $data,
        array $rules,
        array $messages = [],
        array $customAttributes = [],
        \Closure $callback = null
    ): ValidatorInterface
    {
        $translator = $this->createErrorTranslator();

        return new Validation\Validator(
            $this->makeValidator($data, $rules, $messages, $customAttributes),
            $translator,
            $callback
        );
    }
Create a Laravel validator that has JSON API error objects.

@param array $data
@param array $rules
@param array $messages
@param array $customAttributes
@param \Closure|null $callback
a closure for creating an error, that will be bound to the error translator.
@return ValidatorInterface