Equivalent to python's uuid.uuid4().hex in javascript? - Stack Overflow

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Python has functionality to create hex UUID's like so:

>>> import uuid
>>> uuid.uuid4().hex
'47be94c37e484e13ab04ed3c54a5b681'

• Is it possible to do the same in client javascript, with the same hex formatting?
• Is there a way to "validate" the UUID the client sends back? I.e. prevent or notice if a malicious user sends back "1234abcdsh*t..."

A solution idea is to just generate each of the 32 characters randomly on the frontend, but I don't know if there's anything special about the hex UUID's, and I'm also not sure if there's a good way to validate the client sent back a valid value (and not a series of 32 a's)

Edit: just realized there's nothing special about the "hex" formatting, it's just missing the dashes. Will leave that bullet up in case it confuses anyone else.

Python has functionality to create hex UUID's like so:

>>> import uuid
>>> uuid.uuid4().hex
'47be94c37e484e13ab04ed3c54a5b681'

• Is it possible to do the same in client javascript, with the same hex formatting?
• Is there a way to "validate" the UUID the client sends back? I.e. prevent or notice if a malicious user sends back "1234abcdsh*t..."

A solution idea is to just generate each of the 32 characters randomly on the frontend, but I don't know if there's anything special about the hex UUID's, and I'm also not sure if there's a good way to validate the client sent back a valid value (and not a series of 32 a's)

Edit: just realized there's nothing special about the "hex" formatting, it's just missing the dashes. Will leave that bullet up in case it confuses anyone else.

• javascript
• python
• security
• cryptography
• uuid

Share Improve this question Follow edited Apr 5, 2018 at 3:57 raphaelrk asked Apr 5, 2018 at 3:33 raphaelrkraphaelrk 83711 gold badge1111 silver badges1818 bronze badges 9

• Is there a way to validate the client sends back a valid UUID? && I'm also not sure if there's a good way to validate the client sent back a valid value - can you clarify what it is you want then? (besides can you do this in JavaScript) – Randy Casburn Commented Apr 5, 2018 at 3:35
• Well that wasn't so hard...I like Google, I remend it really: github./kelektiv/node-uuid – Randy Casburn Commented Apr 5, 2018 at 3:37
• 1 Possible duplicate of Create GUID / UUID in JavaScript? – Randy Casburn Commented Apr 5, 2018 at 3:38
• 2 while that duplicate has some interesting answers, for a v4 UUID nothing beats const uuidv4 = () => ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)); ... or const uuidv4hex = () => ([1e7,1e3,4e3,8e3,1e11].join('')).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)); for the .hex equivalent :p – Jaromanda X Commented Apr 5, 2018 at 3:48
• 1 well, validating would require code on the server to check - you haven't specified your server language, so, all I can say is that you need to make sure the 13th? character is 4, and and the 17th character is 8->f (I think) – Jaromanda X Commented Apr 5, 2018 at 3:55

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1 Answer 1

Sorted by: Reset to default 3

You can use buffer to convert to hex conveniently.

const uuid = require('uuid')
const buffer = Buffer.alloc(16);

uuid.v4({}, buffer);
console.log(buffer.toString('hex'));

Not the cleanest and most elegant solution but will get the job done.

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