Uses promises with the AWS SDK for JavaScript

test-with-q.js

var AWS = require('aws-sdk');
var s3 = new AWS.S3();

var Q = require('q');
var list = Q.nbind(s3.listBuckets.bind(s3));
list().then(function(data) {
  console.log(data);
});

test-with-when-promisify.js

var AWS = require('aws-sdk');
var s3 = new AWS.S3();

var promisify = require('when-promisify');
var list = promisify(s3.listBuckets.bind(s3));
list().then(function(data) {
  console.log(data);
});

// alternate method
var list = promisify(s3, 'listBuckets');
list().then(function(data) {
  console.log(data);
});