Get external IP address in Node.js

gistfile1.txt

var ipModule = (function() {

    // Private stuff
    var my = {};
    var options = {
        hostname: 'jsonip.com'
    };

    // Get the external IP address of this server using the JSON IP server
    my.getIP = function(cb) {
        var ipAddr = '';
        // Make the web request
        var req = http.request(options, function(res) {
            res.setEncoding('utf8');
            // Make sure we get all the data from the response
            res.on('data', function (chunk) {
                ipAddr += chunk;
            });
            // Response has finished so callback, null is because we  should
            // indicate there was no error
            res.on('end', function() {
                cb(null, JSON.parse(ipAddr).ip);
            });
        });
        // We must say we have finished the request
        req.end();
    }
    return my;
}());