I would like to know if its somehow possible to create folders on a local server with a node js application and than upload some stuff. Or if thats impossible. If its not possible directly with node, is there another method how I could solve this problem ?
Node has a file system API with good documentation.
What you are looking for is fs.mkdir: http://nodejs.org/api/fs.html#fs_fs_mkdir_path_mode_callback
There is a module for recursively creating directories called mkdirp: https://www.npmjs.org/package/mkdirp
Were there not API bindings for these operations, you could have instead used the ChildProcess built in module to spawn a subprocess to do the actual directory creation.