Begin by installing this package through Composer. Edit your project's composer.json file to require coop182/laravel-cron-validator.

"require": {
    "coop182/laravel-cron-validator": "0.*"
}

Next, update Composer from the Terminal:

composer update

Once this operation completes, the final step is to add the service provider. Open app/config/app.php, and add a new item to the providers array.

'Coop182\LaravelCronValidator\CronValidatorServiceProvider'

Add the following to your Model's validation rules

// Add your validation rules here
public static $rules = [
    'cron_field' => 'cron_expression'
];