How to run simple app with koa2?

Question

Problem

I am trying to run simple http server using koa2, but have problems running it.

It uses es6 that is expected to work in future node.js v

Answer 1

Solution

I was able to find workaround and will describe solution that includes installing Babel module

Step 1 - Install Babel and required presets

$ npm install babel-core --save
$ npm install babel-preset-es2015-node5 --save
$ npm install babel-preset-stage-3 --save

Step 2 - Create index.js file with babel-core/register requirement

// set babel in entry file
require('babel-core/register')({
    presets: ['es2015-node5', 'stage-3']
});

require('./app');

Step 3 - Put your sample code inside of app.js

import Koa from 'koa';    
const app = new Koa();

// Setup handler.
app.use(async ctx => {
    ctx.body = "Hello World!";
});

// Start server.
app.listen(3000);

After running node index.js server works like a pie and import, async, await are being processed properly.

References

• koa2 sources
• Documentation should include an example of babel configuration
• Using Babel
• Installation Guide

Answer 2

Upgraded your node version to at least 7.6 after that there is no need to transpile your code using babel which is highly avoidable in production.Node >7.6 version support async/await which is very powerful.