Unable to install packages through npm

Installing packages via npm shows the following message and nothing is installed..

sakthiganesh@ubuntu:~$ npm install express

express@2.3.8 ./node_modules/express

├── mime@1.2.2 ()

├── connect@1.4.1 ()

└─开发者_Go百科─ qs@0.1.0

any solutions ?

Express are installed already in your case. By default npm installs modules in the node_modules subdirectory of the current dir. If you want to install module globally use commands with -g key:

sudo npm install -g express

But good practice are placing modules required for your application in the application directory. Go to directory, where your javascript file took place and run npm install without -g:

cd /var/www/my_app
npm install express