Your first Amazon Alexa skill: Hello World. Running on alexa-app-server.

index.js

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

// Create a skill.
var hello = new alexa.app('hello');

// Launch method to run at startup. 
hello.launch(function(req,res) {
    res.say("Ask me to say hi!");
 
    // Keep session open. 
    res.shouldEndSession(false);
});

// Create an intent.
hello.intent('hello', {
    'slots': {},
    'utterances': [ '{to |}{say|speak|tell me} {hi|hello|howdy|hi there|hiya|hi ya|hey|hay|heya}' ]
    },
    function(req, res) {
        res.say('Hello, World!');
        res.shouldEndSession(false);
    }
);

module.exports = hello;

package.json

{
  "name": "hello",
  "version": "0.0.1",
  "main": "index.js",
  "dependencies": {
    "alexa-app": "*"
  }
}