If it's not that much data (~1000 items) then it's probably easiest to just display it in the Web IDE console and then copy and paste it into excel as mentioned there and in @allObjects' https://www.espruino.com/simple_data_logger link.
However another option is to log it to an SD card as a CSV file. The Original Espruino has an SD card connector on board
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There's a quite in depth tutorial on logging data here as well:
https://www.espruino.com/Data+Collection
If it's not that much data (~1000 items) then it's probably easiest to just display it in the Web IDE console and then copy and paste it into excel as mentioned there and in @allObjects' https://www.espruino.com/simple_data_logger link.
However another option is to log it to an SD card as a CSV file. The Original Espruino has an SD card connector on board