Is common have packages that works globally, they make the work more easy in some ways, provide functionalities, et al..
The difference in npm packages that are installed globally and locally is that you will setup a package like a program avaliable by a CLI(Command Line Interface)¹, this require permissions to write in some directories that the npm normally don’t has.
When you try install some globally package(using the -g):
npm install -g <package>
You can face errors and warnings like this:
npm WARN checkPermissions Missing write access to /usr/lib/node_modules
npm ERR! path /usr/lib/node_modules
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access
npm ERR! Error: EACCES: permission denied, access '/usr/lib/node_modules'
npm ERR! { [Error: EACCES: permission denied, access '/usr/lib/node_modules']
npm ERR! stack:
npm ERR! 'Error: EACCES: permission denied, access \'/usr/lib/node_modules\'',
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'access',
npm ERR! path: '/usr/lib/node_modules' }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator (though this is not recommended).
npm ERR! A complete log of this run can be found in:
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