Clerk Identity Provider Integration
Clerk Suspicious Login Detection
Score every Clerk sign-in from a session.created webhook and revoke the risky sessions within seconds.
Install command
npm install loginllamaAdd LoginLlama to Clerk in one call
Call LoginLlama from a Clerk session.created webhook, which revokes the session within seconds when the score is high. Send the email, IP, and user agent, then allow, challenge, or block based on the returned risk score.
// Install: npm install loginllama
// app/api/webhooks/clerk/route.ts, subscribed to session.created
import { clerkClient } from '@clerk/nextjs/server';
import { verifyWebhook } from '@clerk/nextjs/webhooks';
import { NextRequest } from 'next/server';
import { LoginLlama } from 'loginllama';
const loginllama = new LoginLlama({
apiKey: process.env.LOGINLLAMA_API_KEY!
});
export async function POST(req: NextRequest) {
const evt = await verifyWebhook(req);
if (evt.type !== 'session.created') return new Response('ignored');
// Clerk records the sign-in's IP and browser on the session.
const clerk = await clerkClient();
const session = await clerk.sessions.getSession(evt.data.id);
const activity = session.latestActivity;
const result = await loginllama.check(session.userId, {
ipAddress: activity?.ipAddress,
userAgent: [activity?.browserName, activity?.browserVersion].join(' ')
}).catch(() => null); // Fail open: an outage keeps the session.
if (result && result.risk_score > 7) {
await clerk.sessions.revokeSession(session.id);
}
return new Response('ok');
}Why teams choose LoginLlama for Clerk
Score every login in under 100ms
Detect VPNs, proxies, and TOR exit nodes
Explain why a login is risky with clear risk reasons
Catch errors from the check and logins go ahead during an outage
How it works
Step 1
Install or connect LoginLlama
Choose the SDK or integration point that fits your auth flow and add your API key.
Step 2
Check risk at login time
Send the email, IP, and device context before completing authentication.
Step 3
Act on the risk score
Allow, challenge, or block the login based on risk score and reasons.
Signals we analyze
New device or browser fingerprints
Impossible travel and velocity checks
Bot-like login bursts and credential stuffing
Geo anomalies and risky IP reputation
Works well with your Clerk stack
Clerk login security FAQ
How do I add suspicious login detection to Clerk?
Install LoginLlama with `npm install loginllama`, then call the risk check from a Clerk session.created webhook, which revokes the session within seconds when the score is high. Send the user's email, IP address, and user agent, and branch on the returned risk score.
Will LoginLlama slow down Clerk logins?
No. Risk scoring returns in under 100ms. If LoginLlama is unreachable the check throws an error, so catch it and let the Clerk login go ahead. An outage then never blocks a real user.
What does LoginLlama detect on Clerk logins?
New devices and browser fingerprints, impossible travel and login velocity, credential-stuffing bursts, and traffic from VPNs, proxies, TOR exit nodes, and high-risk IPs — each returned with a clear, human-readable reason code.
Does LoginLlama work with Clerk webhooks, Next.js App Router, Clerk Backend SDK?
Yes. LoginLlama runs at the login step itself, so it works alongside Clerk webhooks, Next.js App Router, Clerk Backend SDK and the rest of your Clerk stack without replacing your existing authentication provider.
Other integrations
LoginLlama works with the same single API call across every stack.
Clerk login protection
Protect Clerk users from suspicious logins
Add LoginLlama in minutes and block risky logins in real time.