Change global npm install modules destination

There are many ways to change the installation destination of your global npm modules. IMO, using a user config file is the cleanest way to do this. If you want to do it this way, just follow this 2 steps.

1. Create ~/.npmrc file if you don't have one. 
2. Add this line to your npmrc file
   
   prefix={Folder Name}
   
   For example, if you want to do global npm installs in ~/.npm-global, then add this line
   
   prefix=~/.npm-global

Viola! That's it! You can now do an npm install and it will install that module to the new folder.