The npm outdated -g command is producing an error message that states "Unable to read the length property of undefined"

I am currently facing an issue while trying to check the version status of my npm installed global packages. When I run the command npm outdated -g --depth=0 in the terminal, I encounter the following error:

npm ERR! Cannot read property 'length' of undefined

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/dangranger/.npm/_logs/2019-03-14T21_58_37_962Z-debug.log

The log file at /Users/dangranger/.npm/_logs/2019-03-14T21_58_37_962Z-debug.log contains the following information:

0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/Cellar/node/11.11.0/bin/node',
1 verbose cli   '/usr/local/bin/npm',
1 verbose cli   'outdated',
1 verbose cli   '-g' ]
2 info using <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="abc5dbc6eb9d8592859b">[email protected]</a>
3 info using <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="127c7d7677526423233c23233c22">[email protected]</a>
4 verbose npm-session 6182351d371bfeb5
...
38 verbose exit [ 1, true ]

If anyone has a solution to this problem, your help would be greatly appreciated.

Thank you!

javascriptnpm

Answer №1

To avoid the hassle of uninstalling and reinstalling Node, you have the option to manually tweak the "lib/outdated.js" file within the "npm/node_modules/npm" path by incorporating the patch from the npm Github site found at this link

All it takes is adding "|| 'global'" to a single line. This solution works effectively and remains effective until the next npm update comes along.

Answer №2

If you're having trouble with the ||'global' command, here are some steps that helped me:

First, open your command prompt and navigate to your root User folder (e.g., C:\Users\User). Then, enter the command npm install -g npm@latest

This will update your npm to the latest version. Try running your installation again; it should work properly now.

Additionally, you can use npm audit fix after updating npm with npm install -g npm@latest

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