My first hook.io microservice

ip-get.js

module['exports'] = function getExternalIp(hook) {
  var store = hook.datastore;
  store.get('externalip', function(err, result) {
    if (err) {
      return res.end(err.message);
    }
    hook.res.write(JSON.stringify(result));
    hook.res.end();
  });
};