How to combine routes in nodejs?

Question

Node.js

I started learning Node.js and wondered how you can combine routes in Node? Now I'll explain what I mean:
Application routes look something like this:

var controllers = require('./controllers'),
    myApp = require('../app'),
    admin = require('../admin');

// Основной роутер
module.exports = function (app) {

    // Отдаем сайт
    app.get('/', myApp.run);

    // Отдаем админ-панель
    app.get('/admin', admin.run);

    // RESTful controllers
    controllers(app);

    // Если нет обработчиков, 404
    app.get('*', function (req, res) {
        res.status(404).send("<h1>Page Not found</h1>");
    });
};

Here we are only interested in it. controllers(app);
It looks like this:

var navigation = require('./navigation'),
    page = require('./page'),
    publication = require('./publication'),
    setting = require('./setting'),
    user = require('./user');

module.exports = function (app) {

    // Navigation controller routes
    navigation(app);

    // Page controller routes
    page(app);

    // Publication controller routes
    publication(app);

    // Setting controller routes
    setting(app);

    // User controller routes
    user(app);

};

Where each controller handles routes like this:

var page = require('../../controllers/page');

module.exports = function (app) {
    app.get('/api/page', function (req, res) {
        res.send(page.page());
    });
};

That is, all requests go through the url /api/"controller"/"method"
Now the question is, is it possible somehow to make it possible to somehow determine in the root router that the url of this type /api/*if so, then call the controller router .
It seems to me that if the requests are not to the api, then why does node'e go through the intermediate handlers of the controllers? or is it saving on matches (since node won't run an intermediate handler if the url doesn't match)?

Answer 1

const apiRouter = require('./api/api');
app.use('/api', apiRouter());

api.js containing routes

const express = require('express');
const router = new express.Router();
const users = require('../../controllers/users');
const pages= require('../../controllers/pages');

module.exports = () => router
  .get('/pages', pages.getPages)
  .get('/user', users.getUsers);

Answer 2

server.js

var routes  = require('./routes/');
var server = express();
routes(server);

var fs = require("fs");
var path = require("path");

module.exports = function (server) {

  fs.readdirSync(path.resolve(__dirname)).forEach(function (file) {
    if (file.substr(-3, 3) === '.js' && file !== 'index.js') {
      var full_path = path.resolve(__dirname) + '/' + file.replace('.js', '');
      // console.log(full_path);
      require(full_path)(server);
    }
  });

};

var testController = require('../controllers/test');

module.exports = function(server) {

  server.get('/test', testController.test);

};