Get latest trusty AMIs

ami.js

var https = require('https');
var body = '';

https.get('https://cloud-images.ubuntu.com/locator/ec2/releasesTable', function(res) {
    res.on('data', function(chunk) { body += chunk; });
    res.on('end', finish);
});

function finish() {
    // Bad JSON -- has trailing comma.
    body = body.replace(/,(\s*)]/, '$1]');

    var rows = JSON.parse(body).aaData;
    rows = rows.filter(function(r) {
        return r[1] === 'trusty' &&
            r[2] === '14.04 LTS' &&
            r[3] === 'amd64' &&
            (r[4] === 'instance-store' || r[4] === 'hvm:instance-store');
    });
    rows = rows.reduce(function(memo, r) {
        var region = r[0];
        var type = r[4];
        var ami = r[6].match(/ami-[0-f]{8}/)[0];
        memo[region] = memo[region] || {};
        if (type === 'instance-store') {
            memo[region].regular = ami;
        } else if (type === 'hvm:instance-store') {
            memo[region].hvm = ami;
        }
        return memo;
    }, {});

    var sorted = {};
    var regions = Object.keys(rows);
    regions.sort();
    regions.forEach(function(r) { sorted[r] = rows[r]; });
    console.log(JSON.stringify(sorted, null, 2));
}