To uninstall the node module:

npm uninstall <module_name>  

This will remove the module from node_modules, but not from package.json.
So when we do npm install again it will download the module.

So to remove the module from package.json use:

npm uninstall <module_name> --save  

This also delete the dependency from 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.

Quelle: stack overflow: "how to uninstall npm modules in node js?"