amazon-app.js

var amazon = require('amazon-product-api'),
    app = require('express')();

var amazonClient = amazon.createClient({
    awsId: process.env.AMAZON_ASSOC_AWS_ID,
    awsSecret: process.env.AMAZON_ASSOC_AWS_SECRET,
    awsTag: process.env.AMAZON_ASSOC_AWS_TAG
});

function getBooks(req, res) {
    "use strict";
    var params = {
        keywords: req.params.keywords,
        searchIndex: 'Books',
        responseGroup: 'Images,ItemAttributes',
        sort: 'relevancerank'
    };

    amazonClient.itemSearch(params).then(function(results) {
        var mappedResult = results.map(function (item) {
            return {
                url: item.DetailPageURL[0],
                image: {
                    url: item.LargeImage[0].URL[0],
                    height: item.LargeImage[0].Height[0]._,
                    width: item.LargeImage[0].Width[0]._
                },
                title: item.ItemAttributes[0].Title[0]
            };
        });
        res.json(mappedResult);
    }).catch(function(err) {
        console.error(err);
        res.status(500).json({error: 'Something went wrong talking to Amazon!'});
    });
}

app.get('/books/:keywords', getBooks);

// start app listening
var port = process.env.VCAP_APP_PORT || 3000;
app.listen(port);
console.log('listening at:', port);