Windows node.js npm install express -g Cannot find module 'express'

Method 1：

 在當前app目錄下執行npm install express

Method 2：

1. 當前用戶環境變量添加NODE_PATH並設置路徑爲C:\Users\YOUR_USER_NAME\AppData\Roaming\npm\node_modules

2. 將%NODE_PATH%添加到當前用戶環境變量path中

Reference:

http://blog.i-evaluation.com/2012/09/17/error-cannot-find-module-express/

http://stackoverflow.com/questions/9587665/nodejs-cannot-find-installed-module-on-windows