server.js

var http = require('http');
var formidable = require('formidable');
var util = require('util');

var server = http.createServer(
    function (req, res) {
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');

        if (req.method.toLowerCase() == 'post') {
            processForm(req, res);
            return;
        }

        if (req.method.toLowerCase() == 'get') {
            var data = {
                data: {
                    languages: [
                        'English',
                        'Spanish',
                        'German',
                        'Other'
                    ]
                }
            };

            var responseData = JSON.stringify(data);
            res.end(responseData);
            console.log("get: ", responseData);
            return;
        }

        res.end();
    }
);

function processForm(req, res) {
    var form = new formidable.IncomingForm();

    form.parse(req, function (err, fields) {

        fields.id = 'randomString';

        res.writeHead(200, {
            'content-type': 'text/plain'
        });

        var data = JSON.stringify({
            fields: fields
        })

        res.end(data);

        console.log('posted fields:\n');
        console.log(data);
    });
}

var port = 3100;
server.listen(port);
console.log("server listening on port " + port);