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<%@ Page Language="C#" AutoEventWireup="true" %>
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<title>Add Google Authenticator 2FA to JavaScript / Node.js | AuthenticatorAPI.com</title>
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<li><a href="/integrate-2fa-php.aspx">PHP</a></li>
<li><a href="/integrate-2fa-python.aspx">Python</a></li>
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<li><a href="/what-is-totp.aspx">What is TOTP?</a></li>
<li><a href="/totp-vs-hotp.aspx">TOTP vs HOTP</a></li>
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<div class="lang-badge">JavaScript / Node.js</div>
<h1>Add 2FA to Your Node.js App</h1>
<p>A complete guide to integrating Google Authenticator using AuthenticatorAPI.com</p>
</div>
<div class="lang-nav">
<span style="line-height:36px;font-size:13px;font-weight:700;color:#888;">Also available in:</span>
<a href="/integrate-2fa-php.aspx">PHP</a>
<a href="/integrate-2fa-python.aspx">Python</a>
<a href="/integrate-2fa-csharp.aspx">C#</a>
<a href="/integrate-2fa-java.aspx">Java</a>
</div>
<p class="lead text-muted">This guide covers adding Google Authenticator TOTP two-factor authentication to Node.js applications — from a minimal Express server to a full Next.js or NestJS project. No npm packages required beyond Node's built-in <code>crypto</code> module and the standard <code>fetch</code> API (Node 18+).</p>
<div class="info-box">👉 <strong>Prerequisites:</strong> Node.js 18+ (for native <code>fetch</code>). For older Node, use the <code>node-fetch</code> package. A database (PostgreSQL, MongoDB, etc.) to store per-user secrets.</div>
<div class="tab-switcher" style="margin-top:30px;">
<button class="active" onclick="switchTab('express', this)">Express.js</button>
<button onclick="switchTab('nextjs', this)">Next.js (App Router)</button>
</div>
<div class="section-heading">Step-by-Step Integration</div>
<div id="tab-express" class="tab-content-block active">
<div class="step-block">
<div class="step-num">1</div>
<h3>Create a TOTP Utility Module</h3>
<pre class="code-block"><span class="cm">// lib/totp.js</span>
<span class="st">'use strict'</span>;
<span class="kw">const</span> { randomBytes } = require(<span class="st">'crypto'</span>);
<span class="kw">const</span> BASE32_ALPHABET = <span class="st">'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'</span>;
<span class="kw">const</span> API_BASE = <span class="st">'https://www.authenticatorApi.com'</span>;
<span class="cm">/**
* Generates a cryptographically random 32-character Base32 secret.
*/</span>
<span class="kw">function</span> <span class="fn">generateSecret</span>(length = <span class="st">32</span>) {
<span class="kw">const</span> bytes = <span class="fn">randomBytes</span>(length);
<span class="kw">return</span> Array.from(bytes, b => BASE32_ALPHABET[b % <span class="st">32</span>]).join(<span class="st">''</span>);
}
<span class="cm">/**
* Returns the HTML img tag for the QR code setup page.
*/</span>
<span class="kw">async function</span> <span class="fn">getQrCodeHtml</span>(appName, userInfo, secret) {
<span class="kw">const</span> params = <span class="kw">new</span> <span class="fn">URLSearchParams</span>({ AppName: appName, AppInfo: userInfo, SecretCode: secret });
<span class="kw">const</span> res = <span class="kw">await</span> <span class="fn">fetch</span>(<span class="vr">`${API_BASE}/pair.aspx?${params}`</span>);
<span class="kw">if</span> (!res.ok) <span class="kw">throw new</span> <span class="fn">Error</span>(<span class="vr">`Pair API error: ${res.status}`</span>);
<span class="kw">return</span> res.<span class="fn">text</span>();
}
<span class="cm">/**
* Returns true if the 6-digit pin is valid for the given secret.
*/</span>
<span class="kw">async function</span> <span class="fn">validatePin</span>(pin, secret) {
<span class="kw">if</span> (!/^\d{6}$/.test(pin)) <span class="kw">return false</span>;
<span class="kw">const</span> params = <span class="kw">new</span> <span class="fn">URLSearchParams</span>({ Pin: pin, SecretCode: secret });
<span class="kw">const</span> res = <span class="kw">await</span> <span class="fn">fetch</span>(<span class="vr">`${API_BASE}/Validate.aspx?${params}`</span>);
<span class="kw">if</span> (!res.ok) <span class="kw">throw new</span> <span class="fn">Error</span>(<span class="vr">`Validate API error: ${res.status}`</span>);
<span class="kw">const</span> text = <span class="kw">await</span> res.<span class="fn">text</span>();
<span class="kw">return</span> text.<span class="fn">trim</span>().<span class="fn">toLowerCase</span>() === <span class="st">'true'</span>;
}
module.exports = { generateSecret, getQrCodeHtml, validatePin };</pre>
</div>
<div class="step-block">
<div class="step-num">2</div>
<h3>Enrolment Route</h3>
<pre class="code-block"><span class="cm">// routes/2fa.js</span>
<span class="kw">const</span> express = require(<span class="st">'express'</span>);
<span class="kw">const</span> router = express.<span class="fn">Router</span>();
<span class="kw">const</span> totp = require(<span class="st">'../lib/totp'</span>);
<span class="kw">const</span> db = require(<span class="st">'../lib/db'</span>);
<span class="cm">// GET /2fa/setup — show the QR code</span>
router.<span class="fn">get</span>(<span class="st">'/setup'</span>, <span class="kw">async</span> (req, res) => {
<span class="kw">const</span> secret = totp.<span class="fn">generateSecret</span>();
req.session.pending2FASecret = secret; <span class="cm">// store until confirmed</span>
<span class="kw">const</span> qrHtml = <span class="kw">await</span> totp.<span class="fn">getQrCodeHtml</span>(<span class="st">'MyApp'</span>, req.user.email, secret);
res.<span class="fn">render</span>(<span class="st">'2fa-setup'</span>, { qrHtml, secret });
});
<span class="cm">// POST /2fa/setup — confirm the user has scanned correctly</span>
router.<span class="fn">post</span>(<span class="st">'/setup'</span>, <span class="kw">async</span> (req, res) => {
<span class="kw">const</span> { pin } = req.body;
<span class="kw">const</span> secret = req.session.pending2FASecret;
<span class="kw">if</span> (<span class="kw">await</span> totp.<span class="fn">validatePin</span>(pin, secret)) {
<span class="kw">await</span> db.<span class="fn">saveEncryptedSecret</span>(req.user.id, secret);
<span class="kw">delete</span> req.session.pending2FASecret;
res.<span class="fn">redirect</span>(<span class="st">'/dashboard'</span>);
} <span class="kw">else</span> {
res.<span class="fn">render</span>(<span class="st">'2fa-setup'</span>, { error: <span class="st">'Invalid code, please try again.'</span>, qrHtml: <span class="kw">await</span> totp.<span class="fn">getQrCodeHtml</span>(<span class="st">'MyApp'</span>, req.user.email, secret), secret });
}
});
<span class="cm">// POST /2fa/verify — called at login time</span>
router.<span class="fn">post</span>(<span class="st">'/verify'</span>, <span class="kw">async</span> (req, res) => {
<span class="kw">const</span> { pin } = req.body;
<span class="kw">const</span> secret = <span class="kw">await</span> db.<span class="fn">getDecryptedSecret</span>(req.user.id);
<span class="kw">if</span> (<span class="kw">await</span> totp.<span class="fn">validatePin</span>(pin, secret)) {
req.session.twoFactorVerified = <span class="kw">true</span>;
res.<span class="fn">redirect</span>(<span class="st">'/dashboard'</span>);
} <span class="kw">else</span> {
res.<span class="fn">render</span>(<span class="st">'2fa-verify'</span>, { error: <span class="st">'Invalid code, please try again.'</span> });
}
});
module.exports = router;</pre>
</div>
<div class="step-block">
<div class="step-num">3</div>
<h3>Middleware to Enforce 2FA</h3>
<pre class="code-block"><span class="cm">// middleware/require2fa.js</span>
<span class="kw">module.exports = async function</span> <span class="fn">require2fa</span>(req, res, next) {
<span class="kw">if</span> (!req.user) <span class="kw">return</span> res.<span class="fn">redirect</span>(<span class="st">'/login'</span>);
<span class="kw">const</span> has2fa = <span class="kw">await</span> db.<span class="fn">userHas2FA</span>(req.user.id);
<span class="kw">if</span> (has2fa && !req.session.twoFactorVerified) {
<span class="kw">return</span> res.<span class="fn">redirect</span>(<span class="st">'/2fa/verify'</span>);
}
<span class="fn">next</span>();
};
<span class="cm">// In your router:</span>
<span class="kw">const</span> require2fa = require(<span class="st">'./middleware/require2fa'</span>);
app.<span class="fn">use</span>(<span class="st">'/dashboard'</span>, require2fa, dashboardRouter);
app.<span class="fn">use</span>(<span class="st">'/settings'</span>, require2fa, settingsRouter);</pre>
</div>
</div><!-- /tab-express -->
<div id="tab-nextjs" class="tab-content-block">
<div class="step-block">
<div class="step-num">1</div>
<h3>Server Action: Generate & Fetch QR Code</h3>
<pre class="code-block"><span class="cm">// app/actions/totp.ts</span>
<span class="st">'use server'</span>;
<span class="kw">import</span> { randomBytes } from <span class="st">'crypto'</span>;
<span class="kw">import</span> { cookies } from <span class="st">'next/headers'</span>;
<span class="kw">const</span> BASE32 = <span class="st">'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'</span>;
<span class="kw">export function</span> <span class="fn">generateSecret</span>(length = <span class="st">32</span>): <span class="dc">string</span> {
<span class="kw">const</span> bytes = <span class="fn">randomBytes</span>(length);
<span class="kw">return</span> Array.from(bytes, b => BASE32[b % <span class="st">32</span>]).join(<span class="st">''</span>);
}
<span class="kw">export async function</span> <span class="fn">fetchQrHtml</span>(appName: <span class="dc">string</span>, email: <span class="dc">string</span>, secret: <span class="dc">string</span>) {
<span class="kw">const</span> params = <span class="kw">new</span> <span class="fn">URLSearchParams</span>({ AppName: appName, AppInfo: email, SecretCode: secret });
<span class="kw">const</span> res = <span class="kw">await</span> <span class="fn">fetch</span>(<span class="vr">`https://www.authenticatorApi.com/pair.aspx?${params}`</span>, { cache: <span class="st">'no-store'</span> });
<span class="kw">return</span> res.<span class="fn">text</span>();
}
<span class="kw">export async function</span> <span class="fn">verifyPin</span>(pin: <span class="dc">string</span>, secret: <span class="dc">string</span>): <span class="dc">Promise</span><<span class="dc">boolean</span>> {
<span class="kw">if</span> (!/^\d{6}$/.test(pin)) <span class="kw">return false</span>;
<span class="kw">const</span> params = <span class="kw">new</span> <span class="fn">URLSearchParams</span>({ Pin: pin, SecretCode: secret });
<span class="kw">const</span> res = <span class="kw">await</span> <span class="fn">fetch</span>(<span class="vr">`https://www.authenticatorApi.com/Validate.aspx?${params}`</span>, { cache: <span class="st">'no-store'</span> });
<span class="kw">return</span> (await res.<span class="fn">text</span>()).<span class="fn">trim</span>().<span class="fn">toLowerCase</span>() === <span class="st">'true'</span>;
}</pre>
</div>
<div class="step-block">
<div class="step-num">2</div>
<h3>Setup Page Route Handler</h3>
<pre class="code-block"><span class="cm">// app/settings/2fa/page.tsx</span>
<span class="kw">import</span> { generateSecret, fetchQrHtml } from <span class="st">'@/app/actions/totp'</span>;
<span class="kw">import</span> TwoFaSetupForm from <span class="st">'@/components/TwoFaSetupForm'</span>;
<span class="kw">export default async function</span> <span class="fn">TwoFaSetupPage</span>() {
<span class="kw">const</span> secret = <span class="fn">generateSecret</span>();
<span class="kw">const</span> qrHtml = <span class="kw">await</span> <span class="fn">fetchQrHtml</span>(<span class="st">'MyApp'</span>, <span class="st">'user@example.com'</span>, secret);
<span class="kw">return</span> (
<div>
<h1>Set Up Two-Factor Authentication</h1>
<div dangerouslySetInnerHTML={{ __html: qrHtml }} />
<p>Manual key: <code>{secret}</code></p>
<<span class="fn">TwoFaSetupForm</span> secret={secret} />
</div>
);
}</pre>
</div>
</div><!-- /tab-nextjs -->
<div class="section-heading">Security Checklist for Node.js</div>
<ul style="font-size:15px;line-height:2;color:#444;">
<li>✅ Use <code>crypto.randomBytes()</code> — never <code>Math.random()</code></li>
<li>✅ Encrypt secrets at rest before storing in your database</li>
<li>✅ Never call the TOTP API from client-side code — always server-side only</li>
<li>✅ Rate-limit the <code>/2fa/verify</code> route with <code>express-rate-limit</code></li>
<li>✅ Rotate the session after successful 2FA (<code>req.session.regenerate()</code>)</li>
<li>✅ Use <code>helmet</code> and HTTPS in production</li>
<li>✅ Provide backup recovery codes for users who lose their device</li>
</ul>
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