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javascript/snippets/uuid-generator-browser.md

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+---
+title: Generate UUID (browser)
+type: snippet
+tags: [browser,random]
+cover: mountain-lake-cottage
+dateModified: 2020-10-22T20:24:44+03:00
+---
+
+Generates a UUID in a browser.
+
+- Use `Crypto.getRandomValues()` to generate a UUID, compliant with [RFC4122](https://www.ietf.org/rfc/rfc4122.txt) version 4.
+- Use `Number.prototype.toString()` to convert it to a proper UUID (hexadecimal string).
+
+```js
+const UUIDGeneratorBrowser = () =>
+  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
+    (
+      c ^
+      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
+    ).toString(16)
+  );
+```
+
+```js
+UUIDGeneratorBrowser(); // '7982fcfe-5721-4632-bede-6000885be57d'
+```