例えば...

app.psgi
```perl
use Amon2::Lite;

post '/api/user/', sub {
  my ($c, $args) = @_;
  my $params = $c->req->parameters;
  my $user = $c->db->select_row('SELECT * FROM `user` FROM `name` = ?', [$params->{name}]);
  return $c->create_response(409) if $user;
  $c->db->query('INSERT INTO `user` (`name`, `email`) VALUES (?, ?)', [$params->{name}, $params->{email}]);
  $user = $c->db->select_row('SELECT * FROM `user` FROM `name` = ?', [$params->{name}]);
  return $c->render_json({
    id     => $user->{id},
    name   => $user->{name},
    email  => $user->{email},
  });
};

__PACKAGE__->to_app;
```

commandline
```shell
mysqladmin -uroot create 'example'
mysql -uroot user -e 'CREATE table `user` (`id` interger unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY, `name` varchar(64) NOT NULL UNIQUE KEY, `email` varchar(64) NOT NULL) ENGINE=InnoDB DEFAULT CHARSET utf8mb4';
plackup -a app.psgi
```