npm install - npm throws EACCES error on installation of Angular CLI

Question

I am unable to install Angular Cli globally through npm. I keep getting this error when I run npm install -g @angular/cli on macOS:

npm ERR! node v6.9.2
npm ERR! npm  v3.10.9
npm ERR! path /usr/local/lib/node_modules
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access

npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
npm ERR!     at Error (native)
npm ERR!  { Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
npm ERR!     at Error (native)
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'access',
npm ERR!   path: '/usr/local/lib/node_modules' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/apple/npm-debug.log

Answer 1

When you use npm install -g on any platform and you get EACCES, you are writing to a directory for which you do not have write permission.

Some may recommend using sudo, but this will lead to more problems in the future. The npm documentation provides options to fix this.

I highly recommend using a node version manager like nodenv as the solution.