Proper way to remove middleware from the Express stack?

Question

Is there a canonical way to remove middleware added with app.use from the stack? It seems that it should be possible to just modify the app.stack array directl

Answer 1

Following from the hints above, I've add success with the following on express 4.x. My use case was logging what was coming in with Slack Bolt, so I could capture and then mock it:

// Define a handy function for re-ordering arrays
Array.prototype.move = function(from, to) {
  this.splice(to, 0, this.splice(from, 1)[0]);
};

// Use the normal use mechanism, so that 'extra' stuff can be done
// For example, to log further up the order, use app.use(morgan("combined"))
app.use([my-middleware]); 

// Now adjust the position of what I just added forward
const numElements = app._router.stack.length;
app._router.stack.move(numElements - 1, 1);

You can use console.log("Stack after adjustment", app._router.stack) to confirm the new order is what you want. (For Slack Bolt, I had to use app.receiver.app because the Bolt app wraps the express app.)