routes.js

exports.register = function (plugin, options, next) {
  plugin.route({
    method: 'get',
    path: '/',
    handler: function (request, reply) {
      reply('hello, world');
    }
  });
  
  next();
};

exports.register.attributes = {
  name: 'routes',
  version: '1.0.0'
};

server.js

var Hapi = require('hapi');
var server = new Hapi.Server();
var routes = require('./routes');

server.pack.register(routes, function (err) {
  server.start();
});