ULID

One common need for distributed systems are identifiers. ULIDs are a universally unique lexicographically sortable identifier with some nice properties. They are 128-bit values, encoded as 26 character strings which also encode the timestamp. They play very nicely with Deno KV.

import { ulid } from "jsr:@std/ulid@1";

console.log(ulid());
console.log(ulid());
console.log(ulid());

const timestamp = Date.now();
console.log(ulid(timestamp));
console.log(ulid(timestamp));
console.log(ulid(timestamp));

import { decodeTime } from "jsr:@std/ulid@1";
const myULID = ulid();
console.log(decodeTime(myULID));

import { monotonicUlid } from "jsr:@std/ulid@1";
console.log(monotonicUlid(150000)); // 000XAL6S41ACTAV9WEVGEMMVR8
console.log(monotonicUlid(150000)); // 000XAL6S41ACTAV9WEVGEMMVR9
console.log(monotonicUlid(150000)); // 000XAL6S41ACTAV9WEVGEMMVRA

Run this example locally using the Deno CLI:

deno run https://docs.deno.com/examples/scripts/ulid.ts

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