First of all, put use strict; in use.

I'm not using Dancer, but it seems that you should use jwt() instead of bare jwt. And try to get plugin code from your $app reference, it seems more accurate and safe: 

package Util {
  use Dancer2;
  use Dancer2::Plugin::JWT;
  sub before_request {
    my $app = shift;
    my $jwt_plugin = $app->find_plugin('Dancer2::Plugin::JWT') 
      or $app->dsl->send_error('Could not find JWT plugin');
    my $jwt = $jwt_plugin->jwt();
    print "BEFORE REQUEST WORKED: " . $app->name . " " . $jwt . "\n";
  }
};

[download]

More of how to use Dancer plugins read in documentation Dancer2::Plugin.

In reply to Re: Dancer2 JWT with multiple apps isn't working by alexander_lunev
in thread Dancer2 JWT with multiple apps isn't working by clemep8

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