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Showing content from https://docs.npmjs.com/cli/v6/commands/npm-uninstall below:

npm-uninstall

Remove a package

npm uninstall [<@scope>/]<pkg>[@<version>]... [-S|--save|-D|--save-dev|-O|--save-optional|--no-save]
aliases: remove, rm, r, un, unlink

This uninstalls a package, completely removing everything npm installed on its behalf.

Example:

In global mode (ie, with -g or --global appended to the command), it uninstalls the current package context as a global package.

npm uninstall takes 3 exclusive, optional flags which save or update the package version in your main package.json:

-S, --save: Package will be removed from your dependencies.
-D, --save-dev: Package will be removed from your devDependencies.
-O, --save-optional: Package will be removed from your optionalDependencies.
--no-save: Package will not be removed from your package.json file.

Further, if you have an npm-shrinkwrap.json then it will be updated as well.

Scope is optional and follows the usual rules for scope.

Examples:

npm uninstall sax --save

npm uninstall @myorg/privatepackage --save

npm uninstall node-tap --save-dev

npm uninstall dtrace-provider --save-optional

npm uninstall lodash --no-save