tl&dr: Hashids has been upgraded & rebranded to Sqids.

Hashids is a small library that generates short unique IDs from numbers. By now, it supports implementations in many different programming languages. It has served the community well over the last few years & we believe we can improve it in a few ways:

1. Repos are now hosted in one place. That way it's easier to maintain & update code (existing repos stay where they are).
2. Consistent output. All supported programming languages produce the same IDs.
3. Simpler algorithm. The new algorithm produces better randomized IDs, while keeping implementation simple.
4. Simplified API. Only encode and decode functions w/ clear indication for the largest supported unsigned integer.
5. No more salt. Support for custom IDs is now done by providing a manually shuffled alphabet. This is an optional step.
6. Profanity blocklist. Support for blocking specific words from appearing in generated IDs. Libraries come with a basic default blocklist for several languages.
7. Clear goals & examples. More defined use-cases that emphasize what this library is good for (and not good for).
8. New name. No association with hashes anymore + shorter name.
9. Updated website. Now includes use-cases, playground, easier repo filtering, FAQs & features.
10. Sponsor support. To ensure that the project can be sustained for years to come.

Nothing. Existing implementations stay where they are. They have plenty of on-going usage & the new website links to them as well.

No. Sqids produces different IDs. We advise to use it only on new projects or if you are not using any pre-generated IDs.

No. Upgrading repos is an on-going process. You can see the progress here. You can also help by contributing.

Now. Most implementations have already been published.

Sqids website is a good starting place.