otplib

HMAC-based (HOTP) and Time-based (TOTP) One-Time Password library
v12.0.1 URL: https://unpkg.com/otplib@12.0.1/index.js
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totphotpotpauthenticatorone time passwordgoogle authenticatorauthentication2FA2 factornodebrowser

otpauth

One Time Password (HOTP/TOTP) library for Node.js, Deno, Bun and browsers
v9.4.0 URL: https://unpkg.com/otpauth@9.4.0/dist/otpauth.esm.js
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otphotptotpone time password2fa2 factortwo factortwo-factor2step2 steptwo steptwo-stepauthauthenticatorgoogle authenticator

speakeasy

Two-factor authentication for Node.js. One-time passcode generator (HOTP/TOTP) with support for Google Authenticator.
v2.0.0 URL: https://unpkg.com/speakeasy@2.0.0/index.js
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authenticationgoogle authenticatorhmachotpmulti-factorone-time passwordpasswordstotptwo factortwo-factortwo-factor authentication

otp

OTP utility for Google Authenticator
v1.1.2 URL: https://unpkg.com/otp@1.1.2/otp.js
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one-time-passwordgoogle authenticatorhotptotpotp

jsotp

Javascript One-Time Password module.
v1.0.4 URL: https://unpkg.com/jsotp@1.0.4/lib/jsotp.js
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otptotphotprfc6238rfc4226