Flavio Copes

window.crypto.randomUUID() is a JavaScript method that generates v4 UUIDs, making it easier to create unique identifiers in web applications. This method is part of the Web Crypto API and is supported in all modern browsers. It's simple to use, requires no external libraries, and uses a cryptographically strong random number generator that conforms to RFC 4122 standards.

Generating UUIDs in JavaScript with window.crypto.randomUUID()

Didn’t know this was a thing. Actually super useful

when window is not a thing or in insecure context:
<pre><code class="language-javascript">function uuidv4() {
 return &#x27;10000000-1000-4000-8000-100000000000&#x27;.replace(/[018]/g, (c) =&gt;
 (
 +c ^
 (crypto.getRandomValues(new Uint8Array(1))[0] &amp; (15 &gt;&gt; (+c / 4)))
 ).toString(16)
 )
}
console.log(uuidv4());
</code></pre>
source: <a href="http://stackoverflow.com/questions/105034" target="_blank" rel="noopener nofollow">http://stackoverflow.com/questions/105034</a>