Create your own Universally Unique Identifier (UUID) - v4

uuidv4-custom.js

function uuidv4() {
  const init = "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";
  return init.replace(/[xy]/g, (c) => {
    const r = Math.random() * 16 | 0; 
    const v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}