typeid

TypeID

A type-safe, K-sortable, globally unique identifier inspired by Stripe IDs

What is it?

TypeIDs are a modern, type-safe extension of UUIDv7. Inspired by a similar use of prefixes in Stripe's APIs.

TypeIDs are canonically encoded as lowercase strings consisting of three parts:

1. A type prefix (at most 63 characters in all lowercase snake_case ASCII [a-z_]).
2. An underscore '_' separator
3. A 128-bit UUIDv7 encoded as a 26-character string using a modified base32 encoding.

Here's an example of a TypeID of type user:

user_2x4y6z8a0b1c2d3e4f5g6h7j8k
└──┘ └────────────────────────┘
type    uuid suffix (base32)

A formal specification defines the encoding in more detail.

Online Converter

You can try converting UUID to TypeID and back using Jetify's TypeID Converter. Paste your TypeID string to convert to UUID or put your prefix and UUID in this format: prefix:UUID to convert to TypeID.

jetify.com/typeid

Benefits

• Type-safe: you can't accidentally use a user ID where a post ID is expected. When debugging, you can immediately understand what type of entity a TypeID refers to thanks to the type prefix.
• Compatible with UUIDs: TypeIDs are a superset of UUIDs. They are based on the upcoming UUIDv7 standard. If you decode the TypeID and remove the type information, you get a valid UUIDv7.
• K-Sortable: TypeIDs are K-sortable and can be used as the primary key in a database while ensuring good locality. Compare to entirely random global ids, like UUIDv4, that generally suffer from poor database locality.
• Thoughtful encoding: the base32 encoding is URL safe, case-insensitive, avoids ambiguous characters, can be selected for copy-pasting by double-clicking, and is a more compact encoding than the traditional hex encoding used by UUIDs (26 characters vs 36 characters).

Implementations

Implementations should adhere to the formal specification.

Latest spec version: v0.3.0

Official Implementations by jetify

Language	Status	Spec Version
Go	✓ Implemented	v0.3
SQL	✓ Implemented	v0.2
TypeScript	✓ Implemented	v0.3

Community Provided Implementations

Language	Author	Spec Version
C# (.Net)	@TenCoKaciStromy	v0.2 on 2023-06-30
C# (.Net Standard 2.1)	@cbuctok	v0.2 on 2023-07-03
C# (.NET)	@firenero	v0.3 on 2024-04-15
Dart	@mistermoe @tbd54566975	v0.3 on 2024-07-02
Elixir	@sloanelybutsurely	v0.3 on 2024-04-22
Elixir	@xinz	v0.1 on 2024-06-03
Erlang	@eproxus	v0.3 on 2024-09-25
Gleam	@okkdev	v0.3 on 2025-07-09
Haskell	@MMZK1526	v0.3 on 2024-04-19
Java	@fxlae	v0.3 on 2024-04-14
Java	@softprops	v0.2 on 2023-07-04
Kotlin	@aleris	v0.3 on 2024-05-18
Lua	@pushcx	v0.3 on 2025-05-21
OCaml	@titouancreach	v0.3 on 2024-04-22
Odin	@prnvbn	v0.3 on 2026-07-15
PHP	@BaseCodeOy	v0.3 on 2024-12-06
Postgres	@blitss	v0.3 on 2024-06-24
Python	@akhundMurad	v0.3 on 2024-04-19
Ruby	@broothie	v0.3 on 2024-04-13
Rust	@conradludgate	v0.3 on 2024-04-12
Rust	@johnnynotsolucky	v0.3 on 2024-05-17
Rust	@Govcraft	v0.3 on 2024-07-15
Scala	@ant8e	v0.3 on 2024-04-19
Scala	@guizmaii	Not validated yet
Swift	@Frizlab	v0.3 on 2024-04-19
T-SQL	@uniteeio	v0.2 on 2023-08-25
TypeScript	@ongteckwu	v0.2 on 2023-06-30
Zig	@nikoksr	v0.3 on 2024-12-29

We are looking for community contributions to implement TypeIDs in other languages.

Command-line Tool

This repo includes a command-line tool for generating TypeIDs. To install it, run:

curl -fsSL https://get.jetify.com/typeid | bash

To generate a new TypeID, run:

$ typeid new prefix
prefix_01h2xcejqtf2nbrexx3vqjhp41

To decode an existing TypeID into a UUID run:

$ typeid decode prefix_01h2xcejqtf2nbrexx3vqjhp41
type: prefix
uuid: 0188bac7-4afa-78aa-bc3b-bd1eef28d881

And to encode an existing UUID into a TypeID run:

$ typeid encode prefix 0188bac7-4afa-78aa-bc3b-bd1eef28d881
prefix_01h2xcejqtf2nbrexx3vqjhp41

Related Work

• UUIDv7 - The upcoming UUID standard that TypeIDs are based on.

Alternatives to UUIDv7 that are also worth considering (but not type-safe like TypeIDs):

• xid
• ulid
• [ksuid