hello.js

//import koa
var koa=require('koa');
//import koa-router which is used to router user request to its path
var Router=require('koa-router');
//import koa-bodyparser which is used to extract parameters from requests

//create a koa instance and store it in app variable
var app=new koa();
var router=new Router();

router.get('/api/v1.0',welcomeapi);

//use the root routes
app.use(router.routes());

//run server on port 3000
app.listen(3000);

//import the router we defined in articles.js
var articles = require('./routes/articles.js');

//apply thhe routes as a middleware
app.use(articles.routes());

function welcomeapi(cnx,next)
{
    cnx.body={message:'Welcome to Oktob API version 1.0'};
}