Arduino Yun Rest API + Node.js communication

Hi, I have a question about Yun Rest API and Node.js communicatoin
I have Yun mini(No SD card).

I uploaded Bridge example in the Yun and I success to get sensor data with

And then, I want to use this data in the localhost.
I tried with node.js to get data from arduino yun like that

var express = require('express');
var path = require('path')
var app = express();

app. get('/',function (req,res){
  res.send('Hello World!');

app.get('', function (req, res) {

In the localhost:3000, I can see 'Hello World!'
But i cannot get the sensor data..

I guess it is not correct way. How can I get data from Yun???