Inspired and compatible with FriendlyID

What is the FriendlyId library?

The FriendlyId library converts a given UUID (with 36 characters) to a URL-friendly ID (a "FriendlyId") which is based on Base62 (with a maximum of 22 characters), as in the example below:

UUID                                        Friendly ID

c3587ec5-0976-497f-8374-61e0c2ea3da5   ->   5wbwf6yUxVBcr48AMbz9cb
|                                           |                              
36 characters                               22 characters or less

In addition, this library allows to:

  • convert from a FriendlyId back to the original UUID; and
  • create a new, random FriendlyId

Why use a FriendlyId?

Universal Unique IDs (UUIDs) provide a non-sequential and unique identifier that can be generated separately from the source database. As a result, it is not possible to guess either the previous or next identifier. That's great, but, to achieve this level of security, a UUID is long (128 bits long) and looks ugly (36 alphanumeric characters including four hyphens which are added to make it easier to read the UUID), as in this example: 123e4567-e89b-12d3-a456-426655440000.

Such a format is:

  • difficult to read (especially if it is part of a URL)
  • difficult to remember
  • cannot be copied with just two mouse-clicks (you have to select manually the start and end positions)
  • can easily become broken across lines when it is copied, pasted, edited, or sent.

(Swift)FriendlyId library solves these problems by converting a given UUID using Base62 with alphanumeric characters in the range [0-9A-Za-z] into a FriendlyId which consists of a maximum of 22 characters (but in fact often contains fewer characters).


Command Line

The Swift package contains a command line for generating and converting to & from UUID format.

Generate a new id (from a random v4 UUID)

$ friendly-id

Convert a UUID into a "FriendlyId"

$ friendly-id 921bcf08-1279-4e0a-9e0d-e5a1103c5def 

Convert a FriendlyId into a UUID

$ friendly-id 4RhaTeTKMOdHxagaj2XAcR 

Swift Package

FriendlyId can also be integrated into your Swift projects using Swift Package Manager.

Swift Package Manager dependency

.package(url: "", .upToNextMinor(from: "1.0.0")),

Generate a FriendlyId

let id = Id(algorithm: .random)

Convert UUID to FriendlyId

let id = Id(uuid: UUID(uuidString: "921bcf08-1279-4e0a-9e0d-e5a1103c5def")!)

Convert FriendlyId (or UUID) formatted string to UUID

let id = Id(string: "4RhaTeTKMOdHxagaj2XAcR")!
let id = Id(string: "921bcf08-1279-4e0a-9e0d-e5a1103c5def")!


  • Swift Tools 5.3.0
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Last updated: Wed Nov 22 2023 10:09:05 GMT-1000 (Hawaii-Aleutian Standard Time)