Express

npm install @janus/express

import express from 'express';
import { janusVerify } from '@janus/express';

const app = express();
app.use(express.json());

app.post('/login',
  janusVerify({
    secretKey: process.env.JANUS_SECRET_KEY!,
    apiUrl: 'https://your-janus.com',
  }),
  (req, res) => {
    // Verification passed — req.janus contains the result
    console.log(req.janus?.risk_score); // e.g., 15
    console.log(req.janus?.action);     // e.g., "allow"
    res.json({ message: 'Logged in' });
  }
);

janusVerify({
  // Required
  secretKey: process.env.JANUS_SECRET_KEY!,
  apiUrl: 'https://your-janus.com',

  // Optional: custom token extraction
  tokenExtractor: (req) => req.headers['x-janus-token'] as string,

  // Optional: also reject challenged requests
  rejectActions: ['block', 'challenge'],

  // Optional: custom rejection handler
  onReject: (req, res, result) => {
    res.status(403).render('blocked', { reason: result.error });
  },

  // Optional: callback on success
  onVerify: (req, result) => {
    console.log(`Verified: score=${result.risk_score} action=${result.action}`);
  },
});

import { verifyToken } from '@janus/express';

const result = await verifyToken({
  secretKey: process.env.JANUS_SECRET_KEY!,
  apiUrl: 'https://your-janus.com',
  token: requestBody['janus-token'],
  remoteIp: clientIp,
});

if (!result.success || result.action === 'block') {
  // Reject request
}