routes/oauth2.js
function(type) {
        var qp = {error: type, state: props.state};
        res.redirect(props.redirect_uri + "?" + qs.stringify(qp));
    }
function(type) {
        var qp = {error: type, state: props.state};
        res.redirect(props.redirect_uri + "?" + qs.stringify(qp));
    }
Closure to make this a little shorter