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The ksuid npm package is used to generate KSUIDs (K-Sortable Unique Identifiers), which are globally unique identifiers that are sortable by time. KSUIDs are useful for distributed systems where unique and time-ordered identifiers are needed.
Generate a new KSUID
This feature allows you to generate a new KSUID. The generated KSUID is a 27-character string that is sortable by time.
const KSUID = require('ksuid');
KSUID.random().then(ksuid => console.log(ksuid.string));
Parse an existing KSUID
This feature allows you to parse an existing KSUID string back into a KSUID object. This can be useful for extracting the timestamp or other components from the KSUID.
const KSUID = require('ksuid');
const ksuidString = '1y0108k4h7d8j6k5h7d8j6k5h7d8';
const ksuid = KSUID.parse(ksuidString);
console.log(ksuid);
Extract timestamp from KSUID
This feature allows you to extract the timestamp from a KSUID. The timestamp is the number of seconds since the Unix epoch.
const KSUID = require('ksuid');
KSUID.random().then(ksuid => {
const timestamp = ksuid.timestamp;
console.log(timestamp);
});
The uuid package is used to generate UUIDs (Universally Unique Identifiers). Unlike KSUIDs, UUIDs are not sortable by time, but they are widely used for generating unique identifiers in distributed systems.
The cuid package generates collision-resistant IDs optimized for horizontal scaling and performance. CUIDs are not sortable by time, but they are designed to be highly unique and performant.
The nanoid package generates unique IDs with a focus on performance and small size. NanoIDs are not sortable by time, but they are very fast to generate and have a smaller footprint compared to UUIDs and KSUIDs.
A Node.js implementation of Segment's KSUID library. Supports Node.js 6, 8 and 10
$ npm install ksuid
Require the module:
const KSUID = require('ksuid')
You can create a new instance synchronously:
const ksuidFromSync = KSUID.randomSync()
Or asynchronously:
const ksuidFromAsync = await KSUID.random()
Or you can compose it using a timestamp and a 16-byte payload:
const crypto = require('crypto')
const yesterdayInMs = Date.now() - 86400 * 1000
const payload = crypto.randomBytes(16)
const yesterdayKSUID = KSUID.fromParts(yesterdayInMs, payload)
You can parse a valid string-encoded KSUID:
const maxKsuid = KSUID.parse('aWgEPTl1tmebfsQzFP4bxwgy80V')
Finally, you can create a KSUID from a 20-byte buffer:
const fromBuffer = new KSUID(buffer)
Once the KSUID has been created, use it:
ksuidFromSync.string // The KSUID encoded as a fixed-length string
ksuidFromSync.date // The timestamp portion of the KSUID, as a `Date` object
ksuidFromSync.timestamp // The raw timestamp portion of the KSUID, as a number
ksuidFromSync.payload // A Buffer containing the 16-byte payload of the KSUID (typically a random value)
You can compare KSUIDs:
todayKSUID.compare(yesterdayKSUID) // 1
todayKSUID.compare(todayKSUID) // 0
yesterdayKSUID.compare(todayKSUID) // -1
And check for equality:
todayKSUID.equals(todayKSUID) // true
todayKSUID.equals(yesterdayKSUID) // false
You can check whether a particular buffer is a valid KSUID:
KSUID.isValid(buffer) // Boolean
FAQs
Node.js implementation of K-Sortable Globally Unique IDs
We found that ksuid demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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