item.js

var util = require("util");

exports.show = {
    json: function (req, res) {
        res.send(JSON.stringify(req.item));
    },
    default: function (req, res) {
        this[req.format](req, res);
    }
};

exports.load = function (id, callback) {
    var redis = require("redis"),
        client = redis.createClient();

    client.smembers("items", function (err, ids) {
        var items = [];
        if (ids.length <= 0) {
            callback(err, items);
            client.quit();
        }

        var len = ids.length;
        for (var i = 0; i < len; i++)
        {
            client.multi()
                .get("items:" + ids[i] + ":title")
                .get("items:" + ids[i] + ":description")
                .smembers("items:" + ids[i] + ":keywords")
                .smembers("items:" + ids[i] + ":categories")
                .exec(function (err, replies) {
                    items.push({
                        id: ids[i],
                        title: replies[0],
                        description: replies[2],
                        keywords: replies[3],
                        categories: replies[4]
                    });

                    if (items.length == len)
                    {
                        callback(err, items);
                        client.quit();
                    }
                });
        }
    });
};

server.js

var express = require('express'),
    Resource = require('express-resource'),
    app = express.createServer();

app.resource('item', require('./item'), { format: 'json' });

app.listen(3000);