How to build a blockchain network using Hyperledger Fabric and Composer
Haardik
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This article tells about not using sudo for npm…

This is caused by using sudo to install the first package.
This causes the ~/.npm cache folder with root permissions which means that all subsequent installs also require root permissions.

You can read more here on that and how to resolve it:

A better way is to use nvm and this article tells how to do that.