30-seconds-of-code/snippets/UUIDGeneratorBrowser.md

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Generate UUID (browser)	browser,random	intermediate	blog_images/mountain-lake-cottage.jpg	2017-12-29T09:47:10+02:00	2020-10-22T20:24:44+03:00

Generates a UUID in a browser.

• Use Crypto.getRandomValues() to generate a UUID, compliant with RFC4122 version 4.
• Use Number.prototype.toString() to convert it to a proper UUID (hexadecimal string).

const UUIDGeneratorBrowser = () =>
  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
    (
      c ^
      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
    ).toString(16)
  );

UUIDGeneratorBrowser(); // '7982fcfe-5721-4632-bede-6000885be57d'