Access datastore file (download/upload)

I'm doing a nodejs app and i have some basic questions:

- Is there a SOAP or similar http stream/socket way to upload/download .vmdk files without using c++ SDDK lib?

I know how to create a connection ticket to nfcService(NfcFileManagement) using SOAP but don't know how to use it to get/download content.

- Is there a way to download or upload files from datastore like .vmx files without using PowerCLI methods likeCopy-DatastoreItem ? It's OK if usage of VDDK lib is required.

Thanks!