ExpressJs sample within Umbraco - using uRest to get (and possible to edit) Umbraco content , see http://joeriks.com/2013/02/18/fun-stuff-node-js-in-an-umbraco-site/

server.js

var express = require('express');
app = express();

uRestUser = {
    Username: "admin",
    Password: "xxxxxx",
    Type: "user",
    Token: ""
}
uRestServer = {
    server : "localhost",
    port : 57855,
    path : "/rest"
}

var urest = require('./urest');
app.get('/scripts/node/urest/documents/:id',urest.getDocument);

app.listen(process.env.PORT);

urest.js

var qs = require('querystring');
var http = require('http');

function requestWithToken(actualRequestCallback) {

    if (uRestUser.Token == "") {

        var userString = JSON.stringify(uRestUser);

        var headers = {
            'Content-Type': 'application/json',
            'Content-Length': userString.length
        };

        var options = {
            port: uRestServer.port,
            server: uRestServer.server,
            path: '/rest/token',
            method: 'POST',
            headers: headers
        };

        var requestToken = http.request(options, function (response) {
            var str = "";
            response.on('data', function (data) {
                str += data;
            });
            response.on('end', function () {
                var responseobject = JSON.parse(str);
                if (typeof responseobject != undefined) {
                    uRestUser.Token = responseobject.Value;
                    actualRequestCallback();
                }
            })

        });

        requestToken.write(userString);
        requestToken.end();

    } else {
        actualRequestCallback();
    }
}

function requestGetWithToken(resourceUrl, callback) {

    requestWithToken(function () {

        var authString = qs.stringify({ "auth_username": uRestUser.Username,
            "auth_token": uRestUser.Token
        });

        var headers = {
            'Content-Type': 'application/json'
        };

        var path = uRestServer.path + resourceUrl;

        if (path.indexOf('?') == -1) {
            path += "?";
        } else {
            path += "&";
        }

        path += authString;

        var options = {
            port: uRestServer.port,
            server: uRestServer.server,
            path: path,
            method: 'GET',
            headers: headers
        };

        var request = http.request(options, function (response) {
            var str = "";
            response.on("data", function (data) {
                str += data;
            })
            response.on("end", function (data) {
                callback(str);
            })

        })

        request.end();
    })

}

exports.getDocument = function (req, res) {

    var documentId = req.params.id;
    requestGetWithToken("/documents/" + documentId, function (response) {
        res.send(response);
    });

}