Print an express middleware stack

stackPrinter.js

module.exports = function stackPrinter(req, res, next) {
    console.log('Printing Stack For', req.url);

    function printItem(item, prefix) {
        prefix = prefix || '';

        if (item.route) {
            console.log(prefix, 'Route', item.route.path);
        } else if (item.name === '<anonymous>') {
            console.log(prefix, item.name, item.handle);
        } else {
            console.log(prefix, item.name, item.method ? '(' + item.method.toUpperCase() + ')' : '');
        }

        printSubItems(item, prefix + ' -');
    }

    function printSubItems(item, prefix) {
        if (item.name === 'router') {
            console.log(prefix, 'MATCH', item.regexp);

            if (item.handle.stack) {
                item.handle.stack.forEach(function (subItem) {
                    printItem(subItem, prefix);
                });
            }
        }

        if (item.route && item.route.stack) {
            item.route.stack.forEach(function (subItem) {
                printItem(subItem, prefix);
            });
        }

        if (item.name === 'mounted_app') {
            console.log(prefix, 'MATCH', item.regexp);
        }
    }

    req.app._router.stack.forEach(function(stackItem) {
        printItem(stackItem);
    });

    next();
});

Could u write some example for this middleware script?

Ah! I solved it. For people who drop by this script.

  app.get('/api/blogs', requireLogin, stackPrinter, async (req, res) => {
    const blogs = await Blog
      .find({ _user: req.user.id })
      .cache({
        key: req.user.id
      });
    res.send(blogs);
  });

Results :

[0]  Printing Stack For /api/blogs
[0]  query 
[0]  expressInit 
[0]  jsonParser 
[0]  _cookieSession 
[0]  initialize 
[0]  authenticate 
[0]  Route /auth/google
[0]  - authenticate (GET)
[0]  Route /auth/google/callback
[0]  - authenticate (GET)
[0]  - <anonymous> [Function]
[0]  Route /auth/logout
[0]  - <anonymous> [Function]
[0]  Route /api/current_user
[0]  - <anonymous> [Function]
[0]  Route /api/blogs/:id
[0]  - <anonymous> [Function]
[0]  - <anonymous> [AsyncFunction]
[0]  Route /api/blogs
[0]  - <anonymous> [Function]
[0]  - stackPrinter (GET)
[0]  - <anonymous> [AsyncFunction]
[0]  Route /api/blogs
[0]  - <anonymous> [Function]
[0]  - <anonymous> [AsyncFunction]
[0]  - <anonymous> [AsyncFunction]
[0]  Route /api/upload
[0]  - <anonymous> [Function]
[0]  - <anonymous> [Function]