25 lines
651 B
Markdown
25 lines
651 B
Markdown
---
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title: UUIDGeneratorNode
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tags: node,random,intermediate
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firstSeen: 2017-12-29T09:47:10+02:00
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lastUpdated: 2020-10-22T20:24:44+03:00
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---
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Generates a UUID in Node.JS.
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- Use `crypto.randomBytes()` to generate a UUID, compliant with [RFC4122](https://www.ietf.org/rfc/rfc4122.txt) version 4.
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- Use `Number.prototype.toString(16)` to convert it to a proper UUID.
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```js
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const crypto = require('crypto');
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const UUIDGeneratorNode = () =>
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([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
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(c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
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);
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```
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```js
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UUIDGeneratorNode(); // '79c7c136-60ee-40a2-beb2-856f1feabefc'
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```
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