Hi,

https://www.nesys.uio.no/QuickNII/coordinates.html may be doing what you ask for. It allows you to select a QuickNII series descriptor (JSON format is supported only), and then it immediately attempts to "download" an Excel file containing the coordinates in question. Because of this aspect the file will likely appear in the downloads folder of the browser.

I hope this helps, best regards,

Gergely