Barebones Node.js API

api.js

module.exports = function(app) {
    function sendResponse(res, callback, code, message, data) {
        var data = {code: code, message: message, data: data};
        var content;

        if (callback) {
            content = callback + '(' + JSON.stringify(data) + ')';

            res.writeHead(200, {
                'Content-Length': lengthInUtf8Bytes(content),
                'Content-Type': "application/javascript"
            });
        }
        else {
            content = JSON.stringify(data);

            res.writeHead(200, {
                'Content-Length': lengthInUtf8Bytes(content),
                'Content-Type': "application/json"
            });
        }

        res.write(content);
        res.end();
    }

    function lengthInUtf8Bytes(str) {
        // Matches only the 10.. bytes that are non-initial characters in a multi-byte sequence.
        var m = encodeURIComponent(str).match(/%[89ABab]/g);
        return str.length + (m ? m.length : 0);
    }

    var SUCCESS_CODE = 10,
        ERROR_CODE = 11;

    // TODO: compiling this list from route definitions would be cleaner
    var api = {
        routes: {
            put: {
                'pages': function (match, req, res, next) {
                    var queryData = url.parse(req.url, true).query;
                }
            },
            delete: {
                'users': function (match, req, res, next) {
                    var queryData = url.parse(req.url, true).query;
                    var id = queryData['id'];
                }
            },
            post: {
                'pages': function (match, req, res, next) {
                    var queryData = url.parse(req.url, true).query;
                },
                'account/register': function (match, req, res, next) {
                    passport.authenticate('signup', function (err, user) {
                        });
                    })(req, res, next);
                },
                'account/login': function (match, req, res, next) {
                    passport.authenticate('signin', function (err, user) {
                        });
                    })(req, res, next);
                }
            },
            get: {
                'session': function (match, req, res, next) {
                },
                'pages/([0-9]+)': function (match, req, res, next) {
                    var queryData = url.parse(req.url, true).query;
                },
            }
        }
    };

    return function (req, res, next) {
        var requestType = req.method.toLowerCase();

        for (var route in api.routes[requestType]) {
            var match = new RegExp("/v1/" + route).exec(req.url);

            if (match) {
                console.log('Routing to ' + req.method + ' ' + route, match);

                api.routes[requestType][route](match, req, res, next);

                return; // we'll let the route take it from here
            }
        }

        // there were no matches
        next();
    };
};

server.js

var express = require('express');

var app = express();

// use cookieParser, passport, etc.

var api = require('./api')(app);

app.use(api);

app.listen(5061);