ExpressJS middleware to store data in a local cache on the servre for performance.

localCache.js

require("requirejs").define("models/localCache", [], function () {
    var cache = require('memory-cache');
    return function () {
        return function (req, res, next) {
            if (!!req.localCache) {
                return next();
            }
            var sessionId = req.cookies["connect.sid"];
            req.localCache = cache.get(sessionId) || {};
            res.on('finish', function () {
                cache.put(sessionId,req.localCache);
            });
            return next();
        };
    }
});

To use add to you app:
app.use(localCache())

where localCache is 'require'd using nodejs require of requirejs - whichever is best for you.

also add 'memory-cache' to your dependencies (i.e. via your package.json file) or using:
$ npm install --save memory-cache