Express JS Locals

express-locals.js

// using the res.local syntax
app.all('*', function(req, res, next) {
    db.logs.findOne(function(err, logs) {
        if (err) return console.log("Error: ", err);
        res.local('count',  logs.count);
        res.local('edit', false);
        next();
    });
});

// alternatively the res.locals syntax
app.all('*', function(req, res, next) {
    db.logs.findOne(function(err, logs) {
        if (err) return console.log("Error: ", err);
        res.locals({
            'count':  logs.count,
            'edit': false
        });
        next();
    });
});

// finally, as the second argument to a render call
app.get('/reviews/add', function(req, res) {
    res.render('view.html', {
        review: {
            rating: 0,
            title: "This is the place.",
            article: "This is your review.",
            images: [],
            slug: "your-url"
        }
    });
});

// in the first two cases you can confirm which variables
// have been set simply by inspect the _locals variable
console.log("Locals: ", res._locals);