Random ULID Generator

A ULID (Universally Unique Lexicographically Sortable Identifier) is a 128-bit identifier encoded as a 26-character Crockford Base32 string. It’s designed to sort by time (lexicographic order matches creation order in typical usage), which makes it a strong choice for log-style records, time-ordered events, and append-heavy database tables.

How ULID works

• It combines a 48-bit timestamp (milliseconds since Unix epoch) and 80 bits of randomness.
• This structure allows values generated later to sort after values generated earlier.

JavaScript / TypeScript examples

Using the ulid package:

import { ulid, monotonicFactory } from "ulid";

// normal ULID
const id1: string = ulid();

// monotonic ULIDs
const mono = monotonicFactory();
const a: string = mono();
const b: string = mono(); // guaranteed > a

console.log({ id1, a, b });

When to choose ULID

• Databases where ordering helps (append-heavy tables, time-series-ish rows)
• Event/log identifiers where “newer sorts after older” is useful
• Systems that must generate IDs offline without central coordination

Looking for a sortable random number generator or uuid generator alternative? Our ULID generator provides time-ordered unique identifiers. It functions as a robust random generator and random object generator when you need IDs that sort natively. Better than a basic google random number generator or generic random nr scripts for ordered data.