Create a koa server which parse the post data, Convert the name field to
upper case and respond to client.

If you get this:

    POST / with { name: 'koa' }

Respond with:

    KOA


I have this solution but this does not work :

var koa = require('koa');
var bodyParser = require('koa-bodyparser');

var app = koa();

app.use(bodyParser({
  detectJSON: function (ctx) {
    this.body = ctx.toUpperCase();
  }
}));

app.listen(process.argv[2]);