Koa minimal example
Also see Minimal Koa.JS example with Router & Body parser
const Koa = require('koa');
const app = new Koa();
app.use(async ctx => {
ctx.body = {status: 'success'};
});
app.listen(8080);
To install (see this previous post for a guide on installing NodeJS & NPM):
npm install --save koa
node index.js
Then go to http://localhost:8080/ to see the test page.