see installed packages npm code example

Example 1: npm list global packages

npm list -g --depth 0

Example 2: how to view a list of installed npm packages

npm list -g

Example 3: npm list

npm list	Lists the installed versions of all dependencies in this software
npm list -g --depth 0	Lists the installed versions of all globally installed packages
npm view	Lists the latest versions of all dependencies in this software
npm outdated	Lists only the dependencies in this software which are outdated
npm ls - list packages