Javascript: REST Level 2 w/Status Codes example (Nettuts: How to Build a Hypermedia-Driven REST API)

gistfile1.js

var express = require('express');
var app = express();
var Datastore = require('nedb');
var db = {};
var responder = require('./httpResponder');

var port = process.argv[2] || 3050;
var root = 'http://localhost:' + port;

// Connect to an NeDB database
db.movies = new Datastore({ filename: 'db/movies', autoload: true });

// add an index
db.movies.ensureIndex({ fieldName: 'title', unique: true });

// Necessary for accessing POST data via req.body object
app.use(express.bodyParser());

// Catch-all route to set global values
app.use(function (req, res, next) {
    res.type('application/json');
    res.locals.respond = responder.setup(res);
    next();
});

// Routes
app.get('/', function (req, res) {
    res.send('The API is working.');
});

app.get('/movies', function (req, res) {
    db.movies.find({}, res.locals.respond);
});

app.post('/movies', function (req, res) {
    // handle client error
    // http://www.screencast.com/t/iJImQ3qEF
    if (!req.body.title) {
        res.json(400, { error: { message: 'A title is required to create new movie.' } });
        return;
    }

    // handle server error
    // http://www.screencast.com/t/p0vQW0fTVHEg
    db.movies.insert({ title: req.body.title }, function (err, created) {
        if (err) {
            res.json(500, { error: err });
            return;
        }

        // set location header
        // http://www.screencast.com/t/C6jvMPAekaRU
        res.set('Location', root + '/movies/' + created._id);
        res.json(201, created);
    });
});


app.get('/movies/:id', function (req, res) {
    db.movies.findOne({ _id: req.params.id }, function (err, result) {
        if (err) {
            res.json(500, { error: err });
            return;
        }

        if (!result) {
            res.json(400, { error: { message: 'We did not find a movie with id: ' + req.params.id } });
            return;
        }

        res.json(200, result);
    });
});

app.put('/movies/:id', function (req, res) {
    db.movies.update({ _id: req.params.id }, req.body, function (err, num) {
            res.locals.respond(err, { success: num + " records updated" });
        });
});

app.delete('/movies/:id', function (req, res) {
    db.movies.remove({ _id: req.params.id }, function (err, num) {
        if (err) {
            res.json(500, { error: err });
            return;
        }

        if (num === 0) {
            res.json(404, { error: { message: 'We did not find a movie with id: ' + req.params.id } });
            return;
        }

        // http://www.screencast.com/t/A3KdbpNJ
        res.set('Link', root + '/movies; rel="collection"');
        res.send(204);
    });
});

app.listen(port);