Unless you want to browse the code, there is a much more powerful version of this tool at jsonstat.com/eurostat/

This page is several things:

• A demostration of the JSON-stat for Eurostat package
• A replacement of Eurostat’s API Query Builder
• A viewer for some of the most popular Eurostat datasets
• A CSV downloader

Select a dataset.

Choose time, geographical area and classification categories.

View data, download them as CSV or copy the API request.