There's a quite in depth tutorial on logging data here as well:
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
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