title: express is not defined in express
body: <pre><code>var express = require('express');
  var app = express();
  app.get('/', function(req, res){
      res.send('hello world');
  });
  app.listen(3000);
  </code></pre>
  
  <p>I am getting the following error.</p>
  
  <pre><code>&gt; D:\nodejs\mynode\index.js:2  
  &gt; var app=express();
      ^
  ReferenceError: express is not defined
      at Object.&lt;anonymous&gt; (D:\nodejs\mynode\index.js:2:9)
      at Module._compile (module.js:456:26)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
      at Function.Module._load (module.js:312:12)
      at Function.Module.runMain (module.js:497:10)
      at startup (node.js:119:16)
      at node.js:902:3
  </code></pre>