Obsidian

Cool trick for UUID v4 auto-generation for new notes via template, using the Templater plugin. Just include this in the frontmatter of the template note, and whenever you create a new note with it, it will automatically generate a UUID v4

---
uuid: <%* 
function generateUUID() {
  let dt = new Date().getTime();
  let uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    let r = (dt + Math.random() * 16) % 16 | 0;
    dt = Math.floor(dt / 16);
    return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
  });
  return uuid;
}
tR += generateUUID(); 
%>
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