Hashids.java VS brain

You basically want Hashids but sequential? Why not simple convert a base 10 (0-9) number to hex? (0-F)

I found hashids [1] to be a great compromise between integer ids in the database and copyable non-enumerable strings on the client.

[1] https://hashids.org/

I wonder how this might compare to just storing regular autoincrementing ints in the database, and converting to/from hashids (https://hashids.org/) at the edge. It eliminates the collision concern and stores more compactly at the cost of a tiny amount of encode/decode when processing requests. You’d want to push it down as close to the database layer as possible to avoid inadvertent int ID leaks; I added native hashids support to clickhouse but I’m not sure what other database support might entail.

Since hashids are not really hashes and are not secure at all this is not even achieved. Hashids can be easily decoded without the salt by a simple brute-force attack described by the authors of hashid themselves right on their website: https://hashids.org/

You don't necessarily need to use UUIDs. You could use something like Hashids to generate random strings from your sequential IDs in a reversible way, so that users can't predict what their values will be, but you can decode them as needed.

You should not use UUIDv4 as a primary key. You can use normal int values and then use hashids to make them safe for URL. UUIDv7 might be good to use as well once they are more widely supported as well.

for those researching this topic, I keep a list of these UUID/GUID implementations!

https://github.com/swyxio/brain/blob/master/R%20-%20Dev%20No...

here are my notes as someone who studied this stuff extensively for my book launch (just crossed $200k revenue) https://github.com/sw-yx/brain/blob/906dbc6fd6d22fa69968ebc6...

in generally for OP's stuff i would disagree on launching on product hunt first. PH is a giant pyramid scheme where people just compete for the #1 badge each day. what the most successful products do is launch everywhere else first, and then after a few months email their happy customers to support them on PH. this is why you are #20 because you didnt study the game

I've been collecting all my notes on UUIDs here https://github.com/sw-yx/brain/blob/master/R%20-%20Dev%20Not... in case it is helpful to anyone

(poster here)

these formats are not new new, but are still pretty new.

the context is i keep a list of uuid impls and knowledge for my own reference. posted this up today simply because I got a PR from some subscribers https://github.com/sw-yx/brain/pull/36

Putting together this massive effort involved pulling in notes from 18 months of covering Concurrent React by myself, in particular studying prior art from Rodrigo Pombo in cloning the API from scratch. You can check out his talk here to contrast what he did vs me.