Passing variables to the next middleware using next() in Express.js

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This is what the res.locals object is for. Setting variables directly on the request object is not supported or documented. res.locals is guaranteed to hold state over the life of a request.

res.locals (Note: the documentation quoted here is now outdated, check the link for the most recent version.)

An object that contains response local variables scoped to the
request, and therefore available only to the view(s) rendered during
that request / response cycle (if any). Otherwise, this property is
identical to app.locals.

This property is useful for exposing request-level information such as
the request path name, authenticated user, user settings, and so on.

app.use(function(req, res, next) {
    res.locals.user = req.user;  
    res.locals.authenticated = !req.user.anonymous;
    next();
});

To retrieve the variable in the next middleware:

app.use(function(req, res, next) {
    if (res.locals.authenticated) {
        console.log(res.locals.user.id);
    }
    next();
});

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