ApiController.pm

package W::Controller::ApiController;
use Mojo::Base 'Mojolicious::Controller';
use Log::Log4perl qw(:easy);
use Data::Dumper;
use Data::Printer;
use Role::Tiny::With;

with("W::Controller::Role::FCommon");

sub foo {
    my ($self) = @_;
	  return $self->action();
}

FCommon.pm

package W::Controller::Role::FCommon;

use Data::Printer;
use Mojo::Base -role;


sub action {
    my ($self) = @_;
    my $l = $self->param("SOME_PARAM");
    $self->render_later;
    #DO STH...
    my $result = #promise... from model
    
  	$result->then(sub {
	    my $res = shift;
      #...do sth
      $self->render(template => template_name(), format => "json");
    
    })->catch (sub {
	     my $err = shift->{message};
       $self->render(template => "ErrorTemplate", format => "json", errorType => $err);
    })->wait;
  
}

startup

$api->get('/api/XXX/q/#param')->to('apiController#foo')->name("api_1");