Hashids for scala

A Scala port of hashids.js library to generate short hashes from one or many numbers. Ported from hashids.java by fanweixiao.

  • Hashid is initialized with an alphabet, salt and a minimum hash length
  • It’s possible to hash single and multiple long numbers
  • Hashes are unique across the salt value
  • Hashes are decryptable to a single or multiple numbers respectively
  • Hashes don’t contain English curse words
  • Supports positive long numbers
  • The primary purpose of hashids is to obfuscate ids
  • Do not use hashids for security purposes or compression

The goal of the port

Besides the goals of the original library, this scala port is written without mutable state. Also you get clear exceptions in following cases:

  • IllegalArgumentException when alphabet, you provided, contains duplicates
  • IllegalArgumentException if alphabet contains spaces
  • IllegalArgumentException if alphabet is less then 16 chars long
  • IllegalArgumentException when calling encodeHex with non-HEX string
  • IllegalStateException when calling decode with hash, produced with different salt


Cross-Built for Scala 2.10 and 2.11

libraryDependencies += "com.github.ancane" %% "hashids-scala" % "1.2"
import org.hashids.Hashids, Hashids._


You should provide your own unique salt to get hashes, different from other hashids. Do not use salf from the examples.

val hashids = Hashids("this is my salt")
val hash = hashids.encode(12345L)

> NkK9


During decryption, same salt must be used to get original numbers back:

val hashids = Hashids("this is my salt")
val numbers = hashids.decode("NkK9")

> List(12345L): Seq[Long]

Igor Shymko

Igor Shymko
Lives and works in Kiev, Ukraine. Writes scala programs as full time job, enjoys good electronic music, tasty coffee, good mood, loves snowboarding!