Socket communication - node.js

I have the amazon ami server, through this i want to achieve socket communication by using nodejs, redis server.
I follwed the below to install nodejs and redis server, npm
https://www.metachris.com/2015/10/how-to-install-nodejs-5-on-centos-and-ubuntu/
https://gist.github.com/dstroot/2776679
Even i installed socket server and socket express also.
when i was try to know the express version this i got this error please see the attached screenshot
Can anyone please suggest me what i can do to achieve socket communication in amazon ami server.

Use node package manager commands. npm -v packagename

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