How to see installed packages in npm?

Question

npm

I have MacOS system, node is installed without npm module, npm itself is installed separately. I decided to update npm and after that it stopped seeing installed packages. I suspect that the path or symlinks have broken, I just don’t understand this well yet, so I want to turn to the public for help.
npm root command shows
/Users/username/node_modules
And if npm root -g
/usr/local/lib/node_modules
But when I want to check the list npm ls
/Users/username
└── (empty)
Packages are not seen as previously installed (before update), and again (after the update).
How to return everything back to normal?

Answer 1

Perhaps the packages were globally installed, then npm ls -g

Answer 2

npm cache clean -f
npm install -g n
n stable