Twitter's GDPR-compliant data export lets users download their entire account history as a zip, every tweet, DM, like, follow, ad interaction. The structure is JavaScript files (window.YTD.tweets.part0 = [...]) inside a data/ directory, with a manifest declaring which files contain what. Used heavily during the 2022-2023 X migration wave when users wanted a permanent record of their old tweets.
How to open
Twitter's own browser-based archive viewer (open the included Your archive.html). Online tools like sk22.github.io/twitter-archive-browser. Convert to CSV for spreadsheet analysis.