“npm install -g npm” error: EACCES: permission denied, access '/usr/local/lib/node_modules/npm/node_modules/fast-deep-equal'

[sunmingtao]

mingtao-webpack-new\ =>npm install -g npm
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/fast-deep-equal
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/co
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/json-schema-traverse
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/har-validator
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/npm-user-validate
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/ajv
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules
npm ERR! code EACCES
npm ERR! syscall access
npm ERR! path /usr/local/lib/node_modules/npm/node_modules/fast-deep-equal
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/npm/node_modules/fast-deep-equal'
npm ERR!  [Error: EACCES: permission denied, access '/usr/local/lib/node_modules/npm/node_modules/fast-deep-equal'] {
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'access',
npm ERR!   path: '/usr/local/lib/node_modules/npm/node_modules/fast-deep-equal'
npm ERR! }
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.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/mingtao/.npm/_logs/2020-12-06T19_50_25_047Z-debug.log

[sunmingtao]

Running the command with sudo solves the problem