This is a fairly simple Wordle clone, using fairly simple HTML, CSS, and Javascript. A complete word list is included in the code, but the actual word list used is based on a JSON file from the 3 Brown 1 Blue GitHub.
The JSON file loaded includes the relative frequency with which each word is used. After this list of words is loaded, the words are sorted. When you start typing, a random word is picked from that list- using an exponential function to favor more frequently used words (depending on the configured difficulty).