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!
![5 Ways that CSS and JavaScript Interact That You May Not Know About]()
CSS and JavaScript: the lines seemingly get blurred by each browser release. They have always done a very different job but in the end they are both front-end technologies so they need do need to work closely. We have our .js files and our .css, but...
![Creating Scrolling Parallax Effects with CSS]()
Introduction
For quite a long time now websites with the so called "parallax" effect have been really popular.
In case you have not heard of this effect, it basically includes different layers of images that are moving in different directions or with different speed. This leads to a...
![NSFW Blocker Using MooTools and CSS]()
One of my guilty pleasures is scoping out the latest celebrity gossip from PerezHilton.com, DListed.com, and JoBlo.com. Unfortunately, these sites occasionally post NSFW pictures which makes checking these sites on lunch a huge gamble -- a trip to HR's office could be just a click away.
Since...
![Fading Links Using jQuery: dwFadingLinks]()
UPDATE: The jQuery website was down today which caused some issues with my example. I've made everything local and now the example works.
Earlier this week, I posted a MooTools script that faded links to and from a color during the mouseover and mouseout events.
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) ); } }