Type-safe, prefixed IDs

Short, unique IDs that carry a prefix telling you what they belong to — user_a1b2c3, order_9f8e7d. Readable, secure, and typed — for TypeScript and JavaScript alike.

Get started GitHub

bash

npm install prefid

import { id } from "prefid";

id("user");   // => "user_a8Kd0f2bQ1nR7pZ3xW4mT6y"
id("order");  // => "order_9f8e7d6c5b4a3F2e1D0cB9aX"

const { id } = require("prefid");

id("user");   // => "user_a8Kd0f2bQ1nR7pZ3xW4mT6y"
id("order");  // => "order_9f8e7d6c5b4a3F2e1D0cB9aX"

Self-describing

The prefix tells you what an ID is at a glance — in logs, URLs, and your database.

Type-safe

id("user") is typed as `user_${string}`, so mixing up ID types is a compile error.

Sortable option

sortableId() embeds a time component so IDs sort chronologically — ULID / UUIDv7-style.

Secure

The random part uses the platform's cryptographic RNG — never Math.random().

Zero dependencies

Tiny and focused on one job. Nothing to audit, nothing to bloat your bundle.

Universal

Runs in Node, browsers, Deno, Bun, and edge runtimes. Ships ESM + CommonJS.

Guaranteed-unique helper

ensureUnique() retries against your own store until it finds a free ID.

Ready to give your IDs a name?

Install prefID and generate your first type-safe, prefixed ID in under a minute.

Read the quick start