Get Data from Trello Page as Markdown Using Javascript in the Developer Tools
From a 2018 comment on this blogpost
Still works as of 2023.
var s = [];
s.push("# " + jQuery(".board-header").children()[0].innerText);
jQuery(".list:has(.list-header-name)").each(function() {
s.push("\n## " + jQuery(this).find(".list-header-name")[0].value + "\n\n");
jQuery(this).find(".list-card-title").each(function() {
s.push("- " + this.innerText);
});
});
copy(s.join("\n"));