host multiple express apps on single route

master.js

import morgan from 'morgan';
import bodyParser from 'body-parser';
import express from 'express';
import debug from 'debug';
import {
    ifError
} from 'assert';

// apps exported from their directories
import chichi from '../chichi/main'
import orbital from '../orbital/main'

const app = express();

app.use(morgan(':method :url :status :res[content-length] - :response-time ms'))

function allowCrossDomain(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,POST,OPTIONS');
    res.header(
        'Access-Control-Allow-Headers',
        'Content-Type,Authorization,Content-Length,X-Requested-With',
    );

    if (req.method === 'OPTIONS') {
        res.send();
    } else {
        next();
    }
};

app.use(allowCrossDomain);

// define the apps and thier routes
var Apps = {
    '/chichi': chichi,
    '/orbital_hr': orbital_hr
};

// route to display apps endpoints
app.get('/', function(req, res) {
    res.json(Object.keys(Apps));
})

// app routes go in as separate middleware, that can have nested middleware, meaning all the apps will function as normal
// you could use dynamic require startements if you please, or import like me
for (var k in Apps) {
    app.use(k, Apps[k]);
}

const port = process.env.PORT || 2001

const listener = app.listen(port, (err) => {
    ifError(err);
    debug('app:expressServer')(`Server started all apps successfully on ${listener.address().port}`);
});