Promises - Bluebird - Node

aws-promisify.js

var AWS = require('aws-sdk');
var S3 = Promise.promisifyAll(new AWS.S3());

return S3.putObjectAsync(params);

fs-promisify.js

var fs = Promise.promisifyAll(require("fs"));

fs.readFileAsync("myfile.json").then(JSON.parse).then(function (json) {
    console.log("Successful json")
}).catch(SyntaxError, function (e) {
    console.error("file contains invalid json");
}).error(function (e) {
    console.error("unable to read file, because: ", e.message);
});

x-ray.promisify.js

var Promise = require('bluebird');
var Xray = require('x-ray');
var x = Xray();
var getTitle = Promise.promisify(x('http://google.com', 'title'));
getTitle().then(function(title) {
    console.log(title);  // Google
});