This #OneLiner extracts all API endpoints from AngularJS & Angular javascript files.

curl -s URL | grep -Po "(\/)((?:[a-zA-Z\-_\:\.0-9\{\}]+))(\/)*((?:[a-zA-Z\-_\:\.0-9\{\}]+))(\/)((?:[a-zA-Z\-_\/\:\.0-9\{\}]+))" | sort -u