My feedback from the perspective of a framework developer is quite different. I found the tone and attitude towards express.js to be concerning and somewhat offensive. Here was a developer blaming the framework he chose for poor architecture when they never bothered to actually learn how the framework works in the first place. Everything that followed originated from this basic lack of understanding.
Express is designed with from a classic framework-developer perspective, exposing primarily a 'consumption-only' that allows developers to assemble together complex routing structures.
Express uses a very simple router logic which is at the core of how express works, so let’s examine that first (my knowledge of express is somewhat dated but I think the principal is still the same). Express keeps a hash of the various HTTP methods (GET, POST, etc.) and for each method, an array of middlewares. Each middleware is just a function with signature
function(req, res, next)and an regular expression used to decid