How do I validate the data for a Laravel 5 model in a artisan command?

I have a command that fetches data from an API and push it to my local database using an artisan command. As it's a command, I don't have a Request.

How do I validate the model data? I need to check if the description has only 10 characters and if the due_at date is greater than today.

Rely on database validation is not an option.

via Chebli Mohamed