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@lacspace/otp

v1.2.1Security Kit0 deps

TOTP & HOTP two-factor auth, Google Authenticator compatible — generate secrets, compute/verify codes, parse and build otpauth:// QR URIs, and issue single-use recovery codes. Built on Web Crypto: Node, edge and browser. Zero-dependency, isomorphic.

npm i @lacspace/otp
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Usage

otp.ts
import { generateSecret, keyuri } from "@lacspace/otp";

const secret = generateSecret();            // store this (encrypted) against the user
const uri = keyuri({ secret, label: "user@lacspace.com", issuer: "Lacspace" });
// otpauth://totp/Lacspace:user@lacspace.com?secret=…&issuer=Lacspace&algorithm=SHA1&digits=6&period=30
// → render `uri` as a QR code for the user to scan

Exports 13

base32Decodebase32EncodegenerateBackupCodesgenerateSecrethotpkeyurisetupTotptimeRemainingtotpverifyBackupCodeverifyHotpverifyTotpverifyTotpOnce

Keywords

otptotphotp2fatwo-factorauthenticatorotpauth-urirecovery-codesbase32

More in Security Kit

@lacspace/apikey

Issue & verify API keys the right way — prefixed high-entropy keys, store only the SHA-256 hash, constant-time verify, plus a storage-agnostic record toolkit: public fingerprints, hierarchical scopes, expiry, key rotation with a grace window, and revocation. Isomorphic over Web Crypto.

@lacspace/crypto

Safe, boring cryptography over Web Crypto — authenticated AES-256-GCM, PBKDF2/HKDF key derivation, SHA-256/384/512, HMAC, timing-safe compare and unbiased secure random (tokens, UUIDs, integers). Isomorphic (Node, edge, browser, RN).

@lacspace/headers

Secure HTTP headers & a typed Content-Security-Policy builder — HSTS, CSP nonces & hashes, a typed Permissions-Policy, COOP/COEP/CORP cross-origin isolation, Reporting-Endpoints and report-only, plus ready-made strict and API presets. Framework-agnostic + Next.js. Zero-dependency, isomorphic.

@lacspace/jwt

JSON Web Tokens over Web Crypto — HS/RS/ES/EdDSA signing, JWK/JWKS with kid-based key rotation, and strict expiry/issuer/audience/subject/jti checks. Plus refresh-token rotation and CSRF tokens. Isomorphic — Node, edge, browser.

@lacspace/lock

Account lockout & brute-force protection (server lock) — N-strikes with exponential or progressive/tiered backoff, per-account + per-IP composite locking, allow/deny lists, and a CAPTCHA step-up threshold before hard lockout. Pluggable store, zero-dependency, isomorphic.

@lacspace/mfa

Orchestrate multi-factor auth — combine password + TOTP + passkeys into 2FA/3FA step-up flows with NIST assurance levels (AAL), now with factor enrollment flows, failed-attempt lockout, trusted-device tokens and recovery codes. Isomorphic (bar @lacspace/otp).

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