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.
To check if a specific package is installed globally execute:
npm list -g [package-name]
Let's take "grunt" as an example. If it is installed globally, you should see something like this
C:\data\tryout\test1>npm list -g grunt
C:\Users\xxxxxxx\AppData\Roaming\npm
└── [email protected]
If it is not installed globally, you should see something like this
C:\data\tryout\test1>npm list -g grunt
C:\Users\xxxxxxx\AppData\Roaming\npm
└── (empty)
To check if a specific package is installed locally you can execute the same commands as above but without the -g parameter.
source: How to check if npm package was installed globally or locally.
From your package with sindresorhus/is-installed-globally
https://github.com/sindresorhus/is-installed-globally
Usage:
const isInstalledGlobally = require('is-installed-globally');
// With `npm install your-package`
console.log(isInstalledGlobally);
//=> false
// With `npm install --global your-package`
console.log(isInstalledGlobally);
//=> true
I found this useful when I had to distribute prebuilt files with my package: How to publish a npm package with distribution files? With this package, I can check if the installation is local or global, and then use relative paths for local installations, as shown here.
