.js

var resource = app.swag.createResource('Foo');

resource.get('/foo', {
  name: 'Foos',
  params: {
    filter: 'string',
    itemsPerPage: 'integer'    
  },
  returns: 'SomeModel' //models are declared elsewhere/separately
}, function (req, res) {
  // req.params is already validated; return value is also validated or else an error response is returned
});