In case anyone wants to use APL with the Alexa-App framework (https://github.com/alexa-js/alexa-app)

alexa-app-apl-snippet.js

// Making alexa-app work for APL

var alexa = require("alexa-app");
var app = new alexa.app();

// any old APL document will do
var testAplDoc = require('./templates/test_apl.json')


// determines if the device has a screen
var has_display = function (request) {
  try {
    if ('Alexa.Presentation.APL' in request.data.context.System.device.supportedInterfaces) {
      return true;
    };

    return false;
  } catch (e) {
    return false;
  }
};


// on launch, displays an APL screen
app.launch(function (request, response) {

  response.say("OK").send();

  if (has_display(request)) {
    response.response.response.directives.push(testAplDoc);
    response.shouldEndSession(false);
    response.say("SCREEN").send();
  }

  // because this is an async handler
  return false;
});


// Catches an APL TouchWrapper event and says the argument
app.on('Alexa.Presentation.APL.UserEvent', function (request, response) {

  var componentArgument = request.data.request.arguments[0];
  console.log(componentArgument);

  response.shouldEndSession(false);
  response.say(componentArgument).send();

  return false;
})

// connect to lambda
exports.handler = app.lambda();