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@thi.ng/ksuid
Advanced tools
Configurable K-sortable unique IDs, ULIDs, binary & base-N encoded, 32/48/64bit time resolutions
[!NOTE] This is one of 209 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.
🚀 Please help me to work full-time on these projects by sponsoring me on GitHub. Thank you! ❤️
Configurable K-sortable unique IDs, ULIDs, binary & base-N encoded, 32/48/64bit time resolutions.
Idea based on segmentio/ksuid, though the added flexibility in terms of configuration & implementation also enables the creation of ULIDs:
Feature | KSUID default | ULID default |
---|---|---|
Configurable bit size | 160 bits | 128 bits |
Base-N encoding scheme | base62(1) | base32 (Crockford) |
Timestamp resolution | seconds (32 bits) | milliseconds (48 bits) |
milliseconds (64 bits) | ||
Epoch start time offset | approx. 2020-09-13(2) | none |
Time-only base ID generation | ✅ | ✅ |
ID parsing / decomposition | ✅ | ✅ |
Configurable RNG source(3) | ✅ | ✅ |
KSUID32
is 2156-10-20T18:54:55Zwindow.crypto
, Math.random
as fallbackIDs generated w/ this package are composed of a 32, 48 or 64 bit Unix epochs and
N additional bits of a random payload (from a configurable source). By default
all timestamps are shifted to free up bits for the future. IDs can be generated
as byte arrays or base-N encoded strings. For the latter, the JS runtime MUST
support
BigInt
.
Since v3.1.0 a small CLI for ad-hoc KSUID generation is included. Currently only KSUID32 is supported and IDs are always based on the current time:
npx @thi.ng/ksuid
# 0dwncLZE8byaQdccncWDmsNmlYt
# optionally provide number of random bytes to be used (default: 16)
npx @thi.ng/ksuid 8
# 01ogp9KDpWlQ0pXCY
STABLE - used in production
Search or submit any issues for this package
Since v3.0.0 all
epoch
time-shift config values are to be given in milliseconds. This change is
unifying this behavior and is only a breaking change if using KSUID32
and
specifying custom epoch
offsets (using defaults is not impacted).
Previously, KSUID32
used an offset given in seconds, whereas the other
implementations already used milliseconds.
yarn add @thi.ng/ksuid
ESM import:
import * as ksuid from "@thi.ng/ksuid";
Browser ESM import:
<script type="module" src="https://esm.run/@thi.ng/ksuid"></script>
For Node.js REPL:
const ksuid = await import("@thi.ng/ksuid");
Package sizes (brotli'd, pre-treeshake): ESM: 990 bytes
import { defKSUID32, defKSUID64, defULID } from "@thi.ng/ksuid";
// init 32bit epoch (resolution: seconds) w/ defaults
const id = defKSUID32();
// init 64bit epoch (resolution: milliseconds), same API
const id = defKSUID64();
// init 48bit epoch (resolution: milliseconds), same API
const id = defULID();
id.next();
// '05XCWbXa3akRqLDBUw4ogCVKGkd'
const a = id.nextBinary()
// Uint8Array(20) [
// 0, 160, 48, 77, 101, 251,
// 244, 17, 155, 97, 24, 101,
// 70, 71, 207, 23, 32, 21,
// 244, 116
// ]
// format a binary KSUID
id.format(a);
// '05XCZ32AaDZfZt0SWE2C22o6cqK'
id.parse("05XCZ32AaDZfZt0SWE2C22o6cqK")
// {
// epoch: 1610498125000,
// id: Uint8Array(16) [
// 101, 251, 244, 17, 155, 97,
// 24, 101, 70, 71, 207, 23,
// 32, 21, 244, 116
// ]
// }
new Date(1610498125000).toISOString()
// '2021-01-13T00:35:25.000Z'
Creating custom IDs:
import { BASE36 } from "@thi.ng/base-n";
// using base36, no time shift, 64bit random part
const id36 = defKSUID32({ base: BASE36, epoch: 0, bytes: 8 });
id36.next();
// '2VOUKH4K59AG0RXR4XH'
Benchmarks can be run via yarn bench
. All timings in milliseconds (test
config: Node v20.4.0, MBA M1 2021, 16GB). The benchmark collects N KSUIDs w/
different configs in an array, with each case being run 100 times.
Title | Iter | Size | Total | Mean | Median | Min | Max | Q1 | Q3 | SD% |
---|---|---|---|---|---|---|---|---|---|---|
b62, 128bit, n=10000 | 100 | 1 | 2158.68 | 21.59 | 21.57 | 19.91 | 25.91 | 20.42 | 21.87 | 6.26 |
b62, 64bit, n=10000 | 100 | 1 | 1200.40 | 12.00 | 11.95 | 11.27 | 14.66 | 11.82 | 12.10 | 3.99 |
If this project contributes to an academic publication, please cite it as:
@misc{thing-ksuid,
title = "@thi.ng/ksuid",
author = "Karsten Schmidt",
note = "https://thi.ng/ksuid",
year = 2020
}
© 2020 - 2025 Karsten Schmidt // Apache License 2.0
FAQs
Configurable K-sortable unique IDs, ULIDs, binary & base-N encoded, 32/48/64bit time resolutions
The npm package @thi.ng/ksuid receives a total of 976 weekly downloads. As such, @thi.ng/ksuid popularity was classified as not popular.
We found that @thi.ng/ksuid demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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