Thanks, this suggestion was actually already made by the JWT maintainer (ambs) in github: 
my $jwt_plugin = $app->with_plugin('Dancer2::Plugin::JWT');
my $jwt = $jwt_plugin->jwt();

[download]
and, as you suggest, this: 
my $jwt_plugin = $app->find_plugin('Dancer2::Plugin::JWT');
my $jwt = $jwt_plugin->jwt();

[download]
seems to work also.

In reply to Re^2: Dancer2 JWT with multiple apps isn't working by clemep8
in thread Dancer2 JWT with multiple apps isn't working by clemep8

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