Oslo documentation

Oslo provides a bunch of auth utilities, including APIs for:

  • Creating JWTs
  • OAuth 2.0 clients
  • Hashing passwords
  • Generating cryptographically strong random values
  • Signing and encoding data
  • Verifying WebAuthn responses
  • Zero dependencies (except for oslo/password)

It's lightweight, runtime agnostic, and fully typed.


npm install oslo

This module relies on the Web Crypto API, which is not available by default in Node.js 16 and 18. Make sure to polyfill them:

import { webcrypto } from "node:crypto";

globalThis.crypto = webcrypto;

Or alternatively, enable the flag when running Node.js:

node --experimental-global-webcrypto index.js