Laravel - Encryption - Configuration
Before using Laravel's encrypter, you must set the
key configuration option in your
config/app.php configuration file. This configuration value is driven by the
APP_KEY environment variable. You should use the
php artisan key:generate command to generate this variable's value since the
key:generate command will use PHP's secure random bytes generator to build a cryptographically secure key for your application. Typically, the value of the
APP_KEY environment variable will be generated for you during Laravel's installation.