How to Create a UUID in JavaScript
The UUID identifier has been used in programming since the days a baby-faced David Walsh became a professional software engineer. My first exposure to UUIDs was via a ColdFusion app I inherited and ... the less we say about that the better. In any event, I was recently surprised to see that JavaScript has the ability to create UUIDs.
Developers can use the native JavaScript crypto library to generate a UUID:
crypto.randomUUID() // '5872aded-d613-410e-841f-a681a6aa8d8b'
crypto.randomUUID() // 'fe6c7438-a833-4c7c-9ea3-cdc84ef41dfc'
crypto.randomUUID() // 'e47a03d4-5da3-4451-a2c1-265de99cc2c1'
crypto.randomUUID() // '04cdadeb-0228-43db-85dc-ce7e960a6cde'
It's important to remember that the UUID is not guaranteed to be unique, though the probability of repetition is incredibly low. I look forward to exploring the window.crypto API further to see what other cool things we can do!
![Responsive and Infinitely Scalable JS Animations]()
Back in late 2012 it was not easy to find open source projects using requestAnimationFrame() - this is the hook that allows Javascript code to synchronize with a web browser's native paint loop. Animations using this method can run at 60 fps and deliver fantastic...
![5 Awesome New Mozilla Technologies You’ve Never Heard Of]()
My trip to Mozilla Summit 2013 was incredible. I've spent so much time focusing on my project that I had lost sight of all of the great work Mozillians were putting out. MozSummit provided the perfect reminder of how brilliant my colleagues are and how much...
![Custom Scrollbars in WebKit]()
Before each of the browser vendors we like was providing unique CSS controls, Internet Explorer was setting the tone. One such example is IE's early implementation of CSS filters. Internet Explorer was also the first browser that allowed developers to, for better or worse, customize...
![Pure CSS Slide Up and Slide Down]()
If I can avoid using JavaScript for element animations, I'm incredibly happy and driven to do so. They're more efficient, don't require a JavaScript framework to manage steps, and they're more elegant. One effect that is difficult to nail down with pure CSS is sliding up...
Unfortunately, browser support is very patchy so far…
Plenty of shims/polyills are available.
From https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid
if (! (crypto.randomUUID instanceof Function)) { crypto.randomUUID = function uuidv4() { return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16) ); } }V8 is not equal to JavaScript
Yes, the article should have included ‘node’ or ‘v8’ in the title.
Probably worth mentioning this doesn’t work in Safari or Firefox and is not a W3C Standard nor is it on the W3C Standards Track.
Are there any other libraries that generate uuid other than crypto in js?
https://github.com/uuidjs/uuid
the uuid library
https://www.npmjs.com/package/uuid
A note on browser support would be useful ;) But it‘s great to see that we can soon use it just like that.
Chromium (including Edge): >=92
Firefox: >=95 (Release notes how I discovered the API)
Safari: :(
IE: No!
shim:
if (! (crypto.randomUUID instanceof Function)) { function uuidv4() { return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16) ); } }Turns out I cannot edit comments…
if (! (crypto.randomUUID instanceof Function)) { crypto.randomUUID = function uuidv4() { return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16) ); } }