typing-words.json — the word pool behind https://txtset.com/typing-test/
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WHAT IT IS
  The 1,000 most common English words, in frequency order (the first 200 are
  also written out separately). It is derived from the wordfreq package's
  English frequency ranking, filtered to lower-case a-z words that also appear
  in the site's profanity-filtered dictionary (public/assets/words.json), plus a
  short list of common one- and two-letter words. Regenerate with
  tools/build_typing_words.py; the output is deterministic.

SOURCE
  wordfreq 3.1.1 by Robyn Speer — https://github.com/rspeer/wordfreq
  Code: Apache License 2.0.
  Word data: distributed under the Creative Commons Attribution-ShareAlike 4.0
  licence — https://creativecommons.org/licenses/by-sa/4.0/

  This file is a derivative of that data (a selection and re-ordering of the
  words), so it is shared under the same licence: CC BY-SA 4.0. You may copy
  and adapt typing-words.json provided you credit wordfreq and its sources
  below and share your version under the same terms.

CREDITS REQUIRED BY wordfreq'S SOURCES (quoted from its published notice)
  "wordfreq contains data extracted from Google Books Ngrams
  (http://books.google.com/ngrams) and Google Books Syntactic Ngrams. ...
  acknowledgement of Google Books Ngram Viewer as the source, and inclusion of
  a link to http://books.google.com/ngrams, would be appreciated."

  "wordfreq also contains data derived from the following Creative
  Commons-licensed sources: The Leeds Internet Corpus, from the University of
  Leeds Centre for Translation Studies (http://corpus.leeds.ac.uk/list.html);
  Wikipedia, the free encyclopedia (http://www.wikipedia.org); ParaCrawl, a
  multilingual Web crawl (https://paracrawl.eu)."

  "It contains data from OPUS OpenSubtitles 2018
  (http://opus.nlpl.eu/OpenSubtitles.php), whose data originates from the
  OpenSubtitles project (http://www.opensubtitles.org/) and may be used with
  attribution to OpenSubtitles."

  "It contains data from various SUBTLEX word lists ... created by Marc
  Brysbaert et al. and available at
  http://crr.ugent.be/programs-data/subtitle-frequencies." The SUBTLEX authors
  are credited here, and SUBTLEX is freely available data.

NOTHING ON THE SITE'S SERVER OR YOUR DEVICE IS SENT ANYWHERE
  The list is fetched once by the page and used locally. Typing scores and
  history stay in your browser.