title: Node js Express module.js:340
body: <p>I'm having trouble running my app in node. When I first got the <code>module.js:340</code> error, I used a <code>sudo npm install express -g</code>, and it looked like Express is installed but when I run my app again I get this error. </p>
  
  <pre><code>   module.js:340
          throw err;
                ^
      Error: Cannot find module 'express'
          at Function.Module._resolveFilename (module.js:338:15)
          at Function.Module._load (module.js:280:25)
          at Module.require (module.js:364:17)
          at require (module.js:380:17)
          at Object.&lt;anonymous&gt; (/Users/mac/Downloads/node-FED-master/app.js:6:15)
          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)
      users-Mac-Pro:node-FED-master mac$ 
  </code></pre>