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2.0.3 • Public • Published

Duo Universal Node.js library

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This library allows a web developer to quickly add Duo's interactive, self-service, two-factor authentication to any Node.js web login form.

See our developer documentation at https://www.duosecurity.com/docs/duoweb for guidance on integrating Duo 2FA into your web application.

Duo especially thanks Lukas Hroch for creating the initial version of this library.

Getting Started

This library requires Node.js v14 or later.

To use this client in your existing developing environment, install it from NPM

npm install @duosecurity/duo_universal

Once it's installed, see our developer documentation at https://duo.com/docs/duoweb and the example folder in this repo for guidance on integrating Duo 2FA into your web application.

TLS 1.2 and 1.3 Support

Duo_universal_nodejs uses the Node tls library and OpenSSL for TLS operations. All versions of Node receiving security support (14 and higher) use OpenSSL 1.1.1 which supports TLS 1.2 and 1.3.

Usage Details

1. Import client

import { Client } from '@duosecurity/duo_universal';

2. Create client

Creates new client instance. Provide your Duo Security application credentials and host URL. Include redirect URL to make a way back to your application.

const client = new Client({
    clientId: 'yourDuoApplicationClientId',
    clientSecret: 'yourDuoApplicationSecret',
    apiHost: 'api-12345678.duosecurity.com',
    redirectUrl: 'http://localhost:3000/redirect',

3. Heath check

Determines if Duo’s servers are accessible and available to accept the 2FA request.

const status = await client.healthCheck();

4. Generate state

Generates new state (random string) to link the with authentication attempt. Store appropriately, so you can retrieve/compare on callback.

const state = client.generateState();

5. Create authentication URL

Creates authentication URL to redirect user to Duo Security Universal prompt. Provide user identifier and state generated in previous step.

const authUrl = client.createAuthUrl('username', 'state');

6. Token & code exchange

Exchanges received duo code from callback redirect for token result.

const token = await client.exchangeAuthorizationCodeFor2FAResult('duoCode', 'username');


A complete implementation example can be found in example/. It's a simple express-based application. Please follow the example/README.md to spin it up.


Fork the repository

Install dependencies

npm install

Make your proposed changes. Add tests if applicable, lint the code. Submit a pull request.


npm run test


npm run lint



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