A Node.js implementation of Segment's KSUID library.
You may also be interested in ksuid-cli.
$ npm install ksuidRequire the module:
const KSUID = require('ksuid')You can create a new instance synchronously:
const ksuidFromSync = KSUID.randomSync()Or asynchronously:
const ksuidFromAsync = await KSUID.random()You can also specify a specific time, either in milliseconds or as a Date object:
const ksuidFromDate = KSUID.randomSync(new Date("2014-05-25T16:53:20Z"))
const ksuidFromMillisecondsAsync = await KSUID.random(1401036800000)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.raw // The KSUID as a 20-byte buffer
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) // -1And check for equality:
todayKSUID.equals(todayKSUID) // true
todayKSUID.equals(yesterdayKSUID) // falseYou can check whether a particular buffer is a valid KSUID:
KSUID.isValid(buffer) // Boolean