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javascript/snippets/uuid-generator-node.md

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+---
+title: Generate UUID (Node.js)
+type: snippet
+tags: [node,random]
+cover: digital-nomad-7
+dateModified: 2022-03-14T17:41:43+03:00
+---
+
+Generates a UUID in Node.JS.
+
+- Use `crypto.randomBytes()` 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).
+- [`crypto.randomUUID()`](https://nodejs.org/api/crypto.html#cryptorandomuuidoptions) provides similar functionality.
+
+```js
+const crypto = require('crypto');
+
+const UUIDGeneratorNode = () =>
+  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
+    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
+  );
+```
+
+```js
+UUIDGeneratorNode(); // '79c7c136-60ee-40a2-beb2-856f1feabefc'
+```