Koa Subdomain Router

config.js

module.exports = {
    host: "http://localhost",
    apps: [
        {
            name: "strapi",
            port: 3537,
            redirect: "/admin",
            sub: "admin"
        },
        {
            name: "apis",
            port: 3537,
            sub: "api"
        },
        {
            name: "obsMaster",
            port: 8675,
            sub: "obs"
        },
        {
            name: "io",
            port: 3501,
            sub: "io"
        },
        {
            name: "ui",
            port: 3500,
            sub: "*"
        }
    ]
}

index.js

const Koa = require('koa');
const Subdomain = require('koa-subdomain');
const Router = require('koa-router');
const proxy = require('koa-proxy');
const { apps, host } = require('config');

const app = new Koa();
const subdomain = new Subdomain();

const createRouter = ({ port, redirect, sub }) => {
    const router = new Router();
    if(redirect) {
        router.all('*', ctx => {
            ctx.redirect(`${host}:${port}${redirect}/`);
        })
    } else {
        router.all('*', proxy({ 
            host: `${host}:${port}/`,
            jar: true
        }));
    }
    subdomain.use(sub, router.routes());
};

apps.forEach(app => createRouter(app));

app.use(subdomain.routes());
app.listen(80);