A common misconception about npm is that since it has 'Node' in the name that it must only be used for server side JS modules. This is completely untrue! npm actually stands for Node Packaged Modules, e.g. modules that Node packages together for you. The modules themselves can be whatever you want -- they are just a folder of files wrapped up in a .tar.gz, and a file called package.json that declares the module version and a list of all modules that are dependencies of the module (as well as their version numbers so the working versions get installed automatically).