To uninstall the Node.js module:
npm uninstall <module_name>
This will remove the module from folder node_modules, but not from file package.json. So when we do npm install again it will download the module.
So to remove the module from file package.json, use:
npm uninstall <module_name> --save
This also deletes the dependency from file package.json.
And if you want to uninstall any globally module you can use:
npm -g uninstall <module_name> --save
This will delete the dependency globally.