get-all-express-routes.js

const logAllRoutes = function logAllRoutes(app) {
  app._router.stack
    .map((middleware) => {
      // Return routes registered directly on the app
      if (middleware.route) { return middleware.route }

      // Return routes registered using Router middleware
      if (middleware.name === 'router') {
        return middleware.handle.stack.map(handler => handler.route);
      }
    })
    // Flatten the Array of Arrays
    .reduce((a, b) => a.concat(b), [])
    // Filter out garbage
    .filter(route => route ? route : false)
    // Log formatted route list
    .forEach((route) => {
      for(let verb in route.methods) {
        const padding = new Array(7 - verb.length).join(' ');
        console.log(verb.toUpperCase(), padding, route.path);
      }
    });
}