How to tell if npm package was installed globally or locally

I am installing grunt, node, npm, bower, and grunt-cli on windows7.

The instructions say i should run the install commands with -g flag for global.

How can I check if I used the -g flag when i installed. It will take a lot of time to uninstall them and reinstall.

Use the list command with the -g flag to see all packages that are installed globally:

npm list -g

To check if a specific package is installed globally, you can provide the name of package (grunt in this case) as seen below:

npm list -g grunt

Or you can use grep to filter on package names:

npm list -g | grep grunt

Source: https://docs.npmjs.com/cli/ls

npm list --depth 1 --global packagename > /dev/null 2>&1

You can then check the exit status to see if it's installed or not. Thanks Adam Monsen.