testapp.pl

package Testapp;
use Mojo::Base 'Mojolicious';

sub startup {
    my $app = shift;
    $app->routes->get('/')->to('example#foo');
}

package Testapp::Example;
use Mojo::Base 'Mojolicious::Controller';

sub foo {
    my $self = shift;
    $self->stash( col => [qw(abc def ghi)] );
    $self->respond_to(
        html => sub { $self->render( inline => '<%= shift @$col %>' ) },
        json => {
            json => {
                blah => $self->render_to_string( inline => '<%= shift @$col %>' ),
            },
        },
    );
}

Mojolicious::Commands->start_app('Testapp');