When we start working on an application that's already being developed, one of the first things we want to find out is what are the routes and middleware functions defined. In general, we should be able to deduce that right away from a server.js file for example, but some applications are more complex than that and might load middleware from different files.

To check out what routes and middleware functions are present on the stack, we can iterate through the app._router.stack object, as shown in the following example:

var express = require('express');
var app = express();
var inspect = require('util').inspect;
var morgan = require('morgan');

var users = [{ name: 'John Doe', age: 27 }];

app.use(morgan());

app.route('/users').get(function(req, res, next) {
  res.send(users);
}).post(function(req, res, next) {
  res.send('ok');
});

app._router.stack.forEach(function(item) {
  if (item.route) {
    console.log('Route: %s', inspect(item.route, { depth: 5 })...