Amon2でJSONPを使うとき

マニュアルどおりなんですが
http://amon.64p.org/output.html#json
具体的には

app.psgi

enable 'Plack::Middleware::JSONP';

Web.pm

__PACKAGE__->load_plugins(
    ...,
    'Web::JSON',
);

Web/Dispatcher.pm

any '/' => sub {
    my ($c) = @_;
    my $data = Hogehoge->get_data($c);
    if (defined $c->req->param('type') && $c->req->param('type') eq 'json'){
        return $c->render_json($data);
    } else {
        return $c->render('index.tt' => {data => $data});
    }
};

js(jquery)

$.ajax({
    type: 'GET',
    url: 'http://www.example.net/?type=json&callback=?',
    dataType: 'jsonp',
    success: ...
});

あと
render_jsonに渡すのはUTF8フラグをつけてから

perlのJSONの注意点
http://www.donzoko.net/cgi-bin/tdiary/20100406.html#p01
http://search.cpan.org/dist/JSON/lib/JSON.pm#HOW_DO_I_DECODE_A_DATA_FROM_OUTER_AND_ENCODE_TO_OUTER