Configuration

That configurations are optional, but recommended if you plan to use Craft CMS in headless mode only.

Headless Mode

Set headless mode in your config/general.php to true.

Enable Preview

To enable previewing entries etc. you have to tell Craft CMS, where the frontend lives.

Add a new env var:

WEBSITE_URL="http://localhost:3000"

Add new alias to Craft CMS:

Now add this recently created env var to your config/general.php as an alias.

->aliases([
    '@websiteUrl' => getenv('WEBSITE_URL'),
])

Change Site URL

And finally go to your control panel settings -> sites -> and change the base URL of your Site. If you click on the Craft CMS logo in the left top corner, you should land on your defined WEBSITE_URL