Within companies often Anti-Virus (AV) can impact the installation process of common/recent npm modules.  EPERM errors can occur during the npm -g installation process indicating that there are conflicts between the AV scanning process and the installation.  The default location for node modules has generally been a sensitive directory for AV software %appdata% and can be locked down. 

Node Installation

  • Node will install itself to this directory on your Windows PC C:\Program Files\nodejs\node_modules\npm
  • Following path will be added to the PATH variable C:\Program Files\nodejs\
  • Within this directory is a npmrc file with the following PREFIX default prefix=${APPDATA}\npm

Changing the default location of node_modules

  • You can determine the current node default directory by executing npm config get prefix (you can run this after your following update)
  • Open the npmrc file located in C:\Program Files\nodejs directory.
  • Default value prefix=${APPDATA}\npm  which converts to C:\Users\{username}\AppData\Roaming\npm directory.
  • Change the prefix value to your new custom location i.e. prefix=c:\npm
  • ALSO –> Change the existing PATH variable from c:\Users\{username}\AppData\Roaming\npm to c:\npm (Right click on This PC, Advanced Tab, Environment Variables, Select Path in the list and Edit, find the existing npm path and change it)

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