Okta Webhooks Skill

When to Use This Skill

• Setting up Okta Event Hook handlers
• Implementing the one-time verification challenge (GET handshake)
• Authenticating Okta webhook requests with the Authorization header secret
• Understanding Okta event types and payloads
• Debugging why Okta event hook verification or delivery is failing

How Okta Event Hooks Differ

Okta Event Hooks do not use an HMAC signature. Security relies on two things:

1. One-time verification handshake — When you register the hook, Okta sends a GET request with an x-okta-verification-challenge header. You must reply 200 with JSON {"verification": "<challenge value>"}.
2. Per-request authentication — You choose a secret string that Okta sends in the Authorization header on every event delivery (an HTTPS POST). Verify it with a timing-safe comparison. There is no body signature.

Verification (core)

const crypto = require('crypto');

// 1. One-time verification handshake (GET)
function handleChallenge(req, res) {
  const challenge = req.headers['x-okta-verification-challenge'];
  return res.status(200).json({ verification: challenge });
}

// 2. Per-request auth on every event POST — timing-safe compare of Authorization
function isAuthorized(authHeader, secret) {
  const a = Buffer.from(authHeader || '', 'utf8');
  const b = Buffer.from(secret || '', 'utf8');
  // Length check first: timingSafeEqual throws on unequal-length buffers
  return a.length === b.length && crypto.timingSafeEqual(a, b);
}

Python timing-safe compare: hmac.compare_digest(auth_header, secret).

For complete handlers with route wiring, event dispatch, and tests, see:

• examples/express/
• examples/nextjs/
• examples/fastapi/

Common Event Types

Okta event hooks deliver System Log events. Each item in data.events[] has an eventType field:

For the full event catalog, see Okta event types.

Payload Structure

{
  "eventType": "com.okta.event_hook",
  "eventTime": "2026-07-02T12:00:00.000Z",
  "eventId": "b5a4...",
  "data": {
    "events": [
      {
        "uuid": "d6f5...",
        "eventType": "user.session.start",
        "displayMessage": "User login to Okta",
        "published": "2026-07-02T12:00:00.000Z",
        "actor": { "id": "00u...", "type": "User", "alternateId": "jane@example.com" },
        "target": [ { "id": "00u...", "type": "User", "alternateId": "jane@example.com" } ]
      }
    ]
  }
}

The outer eventType is always com.okta.event_hook. The System Log event type you dispatch on lives at data.events[].eventType.

Environment Variables

OKTA_WEBHOOK_SECRET=your-shared-secret   # The Authorization header value you registered with Okta

Local Development

# Start tunnel (no account needed)
npx hookdeck-cli listen 3000 okta --path /webhooks/okta

Reference Materials

• references/overview.md - Okta Event Hook concepts and events
• references/setup.md - Register an event hook in the Okta Admin Console
• references/verification.md - Verification challenge + Authorization auth details