index.js

const Koa = require('koa');
const Router = require('koa-router');
const cors = require('@koa/cors');

const app = new Koa();
const router = new Router();

//this lets the API make cross origin requests
const corsOptions = {
    origin: 'https://open-saddle-3000.codio-box.uk',
}

router.get('/api', welcomeAPI);

function welcomeAPI(ctx) {
    ctx.body = {
        message: 'This is the root of the API'
    }
}

const articles = require('./routes/articles.js'); 
//const special = require('./routes/special.js');

app.use(router.routes());
//app.use(special.routes());
app.use(articles.routes());
app.use(cors(corsOptions));

// run the app on port 3000
//let port = process.env.PORT || 3000; 
app.listen(3000);