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25 lines
798 B
Markdown
25 lines
798 B
Markdown
# Generate A V4 UUID In The Browser
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The [Web Crypto
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API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API) provides
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a
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[`randomUUID`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID)
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function for generating v4 UUID values which are cryptographically random.
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It works like this:
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```javascript
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> crypto.randomUUID()
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'f2050c5e-af52-4ca2-b4d6-23758b3396c9'
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> crypto.randomUUID()
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'079d5186-84d4-41d6-a660-edafb6a74c86'
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```
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No two UUIDs will be the same. This is a great way to generate IDs that are
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guaranteed to be unique. Or if you need a value that is practically impossible
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to guess.
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I was surprised to see that as of writing this, this function has great browser
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support. Modern versions of all browsers except Internet Explorer have
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implemented `randomUUID`.
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