Apigee BaaS and NodeJS

I am struggling to connect Apigee BaaS which needs authentication from Apigee usign NodeJS.

Can anybody give me snippet if you are aware of? I tried argo module but again got stuck while sending post for authorization. Presently I have below snipprt but i am getting below error

CAN NOT GET /

Snippet

var express = require('express');
var usergrid = require('usergrid');

// Set up Express environment and enable it to read and write JavaScript
var app = express();


var postData = {"grant_type":"password","username":"user","password":"pass"}

var dataClient = new usergrid.client({
     orgName : 'some org',
     appName : 'some app',
     URI:'https://apigee-prod.apigee.net/appservices'
});

  var options = {
    method:'POST',
    endpoint:'/token',
     body:postData
  };

dataClient.request(options, function (error, response) {
        if (error) {
            console.log(response);
        } else {
              dataClient.login(username, password, function (error, response) {
                    if (error) {
                                console.log("dataClient log in FAILED !");
                                //error — could not log user in
                     } else {
                          //success — user has been logged in
                          console.log("dataClient Successfully Logged in !");
                     }
             }
                );
        }
    });

// Listen for requests until the server is stopped
app.listen(process.env.PORT || 9000);
console.log('The server is running!');

Any pointers will be helpful.