Example Alexa App.js

var alexa = require('alexa-app');

// Allow this module to be reloaded by hotswap when changed
module.change_code = 1;

// Define an alexa-app
var app = new alexa.app('catcheckup');

app.launch(function(req,res) {
  // lets see if the user has any pets setup?
  var cats = new Array();
  res.session('cats', cats)
  if (cats.length < 1) {
    var prompt = "You don't appear to have a cat setup, would you like to set a cat up now?";
    var reprompt = "I didn't understand, would you like to setup a cat now?"
    res.session('promptData', { yesAction: 'setupCat'});
  } else if (cats.length == 1) {
    var prompt = "Would you like to know your cats health now?";
    res.session('promptData', { yesAction: 'catHealth'});
  } else {
    var prompt = "Which cat would you like to know the health of?";
  }
  res.say(prompt).reprompt(reprompt).shouldEndSession(false);
});

app.intent('ListPetsIntent', {
    "utterances":["{ List my cats | what cats do I have configured }"]
  },function(req,res) {
    var cats = req.session('cats');
    if (cats.length < 1) {
      res.say('You have no cats setup.').shouldEndSession(false);
    } else if (cats.length == 1) {
      res.say('You have one cat, '+cats[0]+ ' setup').shouldEndSession(false);
    } else {
      var s = cats.slice(0, cats.length - 1).join(', ') + ", and " + cats.slice(-1);
      res.say('You have a few cats setup,' + s).shouldEndSession(false);
    }
  }
);

app.intent('NamePetIntent', {
    "slots":{"NAME":"LITERAL"}
    ,"utterances":["{My cats name is|my pets name} {bob|missy|waffles|NAME}"]
  },function(req,res) {
    var promptData = req.session('promptData');
    if (!promptData) {
      console.log('Got a AMAZON.YesIntent but no promptData. Ending session.');
        res.shouldEndSession(true).send();
    } else if (promptData.yesAction = "setupCat") {

      res.say('Great, your cats name is '+req.slot('NAME') + ". Would you like to tell us more about him now?");
      var cat = req.slot('NAME');
      var cats = req.session('cats');
      cats.push(cat);
      req.session('cats', cats);
      // clear the prompt - and set it for the next action
      req.session('promptData', { yesAction: 'setupMedication' });
    }
  }
);

app.intent("LogPetMedication", {
  "slots":{"NAME":"LITERAL", "MEDICATION":"LITERAL"},
  "utterances":["{NAME} has just had his {MEDICATION} {medication|pill|injection|food|drop}"]
  }, function(req,res) {
    res.say('Understood, '+req.slot("NAME") + " has just had his " + req.slot("MEDICATION"));
  }
);

app.intent('AMAZON.NoIntent', function(req,res){
  var promptData = req.session('promptData');

  if (!promptData) {
    console.log('Got a AMAZON.YesIntent but no promptData. Ending session.');
      res.shouldEndSession(true).send();
  } else if (promptData.yesAction = "setupCat") {
    res.say("Ok, you can setup a cat later just by asking").shouldEndSession(true);
  } else if (promptData.yesAction = "catsHealth") {
    res.say("Ok, I'll be here if you need me");
  } else if (promptData.yesAction = "setupMedication") {
    res.say("Ok, I'll be here if you need me"); 
  } else {
    console.log('Got a AMAZON.NoIntent but invalid promptData. Ending session.');
      res.shouldEndSession(true).send();
  }
  
});

app.intent('AMAZON.YesIntent', function(req,res){
  var promptData = req.session('promptData');

  if (!promptData) {
    console.log('Got a AMAZON.YesIntent but no promptData. Ending session.');
      res.shouldEndSession(true).send();
  } else if (promptData.yesAction = "setupCat") {
    res.say("Ok, what is your pets name?").shouldEndSession(false);
  } else if (promptData.yesAction = "catsHealth") {
    res.say("Your current cats health is..");
  } else if (promptData.yesAction = "setupMedication") {
    res.say("Great, what have you just given your cat?");
  } else {
    console.log('Got a AMAZON.YesIntent but invalid promptData. Ending session.');
      res.shouldEndSession(true).send();
  }
  
});