npm install -g packge does not work in mac & ubuntu

Trying to setup npm -g <package>  on command terminal

npm install -g <package>

Show message

Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
OR
checkPermissions Missing write access to /usr/local/lib/node_modules

Solution: 

Using sudo is not recommended. It may give you permission issue later. While the above works, I am not a fan of changing folders owned by root to be writable for users, although it may only be an issue with multiple users. To work around that, you could use a group, with 'npm users' but that is also more administrative overhead. See here for the options to deal with permissions from the documentation: https://docs.npmjs.com/getting-started/fixing-npm-permissions

I would go for option 2:

To minimize the chance of permissions errors, you can configure npm to use a different directory. In this example, it will be a hidden directory on your home folder.

Make a directory for global installations:

 mkdir ~/.npm-global

Configure npm to use the new directory path:

 npm config set prefix '~/.npm-global'

Within the Terminal, run

 vim ~/.bash_profile

Type i and then paste the following at the top of the file:

 export PATH=~/.npm-global/bin:$PATH

Hit ESC, Type :wq, and hit Enter

Back on the command line, update your system variables:

 source ~/.profile

Test: Download a package globally without using sudo.

npm install -g <package>