What is Sqids?

Sqids (pronounced "squids") is an open-source library that lets you generate short unique identifiers from numbers. These IDs are URL-safe, can encode several numbers, and do not contain common profanity words. Read more .

This is what they look like:


Quick encode & decode example:

case sqids (encode [1, 2, 3]) of
  Left  {} -> print "Something went wrong."
  Right id -> print id -- "86Rf07"
case sqids (decode "86Rf07") of
  Left  {}      -> print "Something went wrong."
  Right numbers -> print numbers -- [1, 2, 3]

If IDs are too short, you can pad them to a certain length:

case runSqids defaultSqidsOptions{ minLength = 10 } (encode [1, 2, 3]) of
  Left  {} -> print "Something went wrong."
  Right id -> print id -- "86Rf07xd4z"

Create unique IDs by shuffling the alphabet:

case runSqids defaultSqidsOptions{ alphabet = "k3G7QAe51FCsPW92uEOyq4Bg6Sp8YzVTmnU0liwDdHXLajZrfxNhobJIRcMvKt" } (encode [1, 2, 3]) of
  Left  {} -> print "Something went wrong."
  Right id -> print id -- "XRKUdQ"

Full documentation is at https://github.com/sqids/sqids-haskell

If you're looking for the original Hashids Haskell, you can find it here: https://github.com/laserpants/hashids-haskell

Use Cases

The main use of Sqids is purely visual. If you'd like to use IDs instead of numbers in your project, Sqids could be a good choice.

Good For

  • Encoding primary keys If you're using a relational database
  • Saving database lookups By encoding multiple objects
  • Temporary login tokens Profanity-free and URL-safe

Not Good For

  • Sensitive data This is not an encryption library
  • User IDs Can reveal user count if anyone finds out the encoding alphabet


  • ๐Ÿ†” Generate short IDs from non-negative numbers
  • โœ… Easy encoding & decoding
  • ๐Ÿซฃ Auto-generated IDs do not contain common profanity
  • ๐ŸŽฒ Support for custom IDs through shuffled alphabet
  • ๐Ÿฅณ 45 integrations (78% using new design)
  • ๐Ÿ“Œ Every version produces the same IDs
  • ๐Ÿป Small library with a permissive license

Example / Playground