Minimal Koa.JS example with Router & Body parser

This is the minimal Koa.JS application which I use as a template for new NodeJS webserver applications.

#!/usr/bin/env node
const router = require('koa-router')();
const koaBody = require('koa-body');
const Koa = require('koa');
const app = new Koa();

app.use(koaBody());

router.get('/', async ctx => {
    ctx.body = "Hello world";
});

app.use(router.routes());

if (!module.parent) app.listen(3000);

Install the requirements using

npm i --save koa koa-router koa-body

and run using

node index.js

assuming you have saved our code from above in index.js.

Now (with the node index.js command still running) go to http://localhost:3000 . You should see Hello world there. Now it’s your turn to continue on your endeavour to develop the world’s greatest webservers :-)