To uninstall a package you have previously installed locally (using npm install <package-name> in the node_modules folder, run

npm uninstall <package-name>

from the project root folder (the folder that contains the node_modules folder).

Using the -S flag, or --save, this operation will also remove the reference in the package.json file.

If the package was a development dependency, listed in the devDependencies of the package.json file, you must use the -D / --save-dev flag to remove it from the file:

npm uninstall -S <package-name>
npm uninstall -D <package-name>

If the package is installed globally , you need to add the -g / --global flag:

npm uninstall -g <package-name>

for example:

npm uninstall -g webpack

and you can run this command from anywhere you want on your system because the folder where you currently are does not matter.