How to Test Auth0 Webhooks

This guide covers everything you need to test Auth0 webhooks — how to inspect the raw payload, verify the signature, forward events to localhost, and reproduce any delivery in your local development environment without needing a real Auth0 event.

How to Test Auth0 Webhooks with WebhookWhisper

1. Create a free endpoint — click Create Live Endpoint above to get a permanent public HTTPS URL (no account required to try)
2. Register the URL in Auth0 — paste the WebhookWhisper URL into Auth0's webhook settings
3. Trigger a test event — use the one-click test payload sender or trigger a real event in Auth0
4. Inspect the request — see the full headers, raw body, and Auth0 signature header in real time
5. Forward to localhost — add a forwarding rule to relay the event to your local handler (e.g. http://localhost:3000/webhooks/auth0)

Auth0 Webhook Signature Verification

Auth0 signs webhook deliveries using RS256 JWT. The signature is sent in the N/A (verify via JWT) header. Always verify this signature before processing the payload to ensure the request came from Auth0 and was not tampered with in transit.

Node.js Verification

const crypto = require('crypto')
const express = require('express')
const app = express()

app.post('/webhooks/auth0',
  express.raw({ type: 'application/json' }),
  (req, res) => {
    const secret = process.env.AUTH0_WEBHOOK_SECRET
    const signature = req.headers['n/a (verify via jwt)']

    // Compute expected HMAC — always use raw body, never parsed JSON
    const expected = crypto
      .createHmac('sha256', secret)
      .update(req.body)
      .digest('hex')

    if (!crypto.timingSafeEqual(Buffer.from(signature || ''), Buffer.from(expected))) {
      return res.status(401).json({ error: 'Invalid signature' })
    }

    const event = JSON.parse(req.body)
    // Process event here — respond first, process async for slow operations
    res.json({ received: true })
  }
)

Python (FastAPI) Verification

import hashlib, hmac, os
from fastapi import FastAPI, Request, HTTPException

app = FastAPI()

@app.post('/webhooks/auth0')
async def webhook(request: Request):
    secret = os.environ['AUTH0_WEBHOOK_SECRET'].encode()
    raw_body = await request.body()
    signature = request.headers.get('n/a (verify via jwt)', '')

    expected = hmac.new(secret, raw_body, hashlib.sha256).hexdigest()

    if not hmac.compare_digest(signature, expected):
        raise HTTPException(status_code=401, detail='Invalid signature')

    payload = await request.json()
    return {'received': True}

Common Auth0 Webhook Errors

Forward Auth0 Webhooks to Localhost

Use WebhookWhisper to receive Auth0 webhook events at a public HTTPS URL and relay them to your local development server — no tunnel, no CLI install, no public server required.

1. Create a WebhookWhisper endpoint and paste it into Auth0's webhook settings
2. In the Forwarding tab, set target URL to http://localhost:3000/webhooks/auth0
3. Every Auth0 event appears in the inspector and hits your local handler simultaneously
4. Use event replay (Pro) to re-send any captured event without triggering a new action in Auth0

FAQ

Do I need a Auth0 account to test webhooks?

No. WebhookWhisper includes a one-click Auth0 sample payload so you can fire a realistic test event and verify your handler without a Auth0 account or triggering a real Auth0 action.

How do I find my Auth0 webhook secret?

The webhook signing secret is shown in Auth0's developer settings or webhook configuration page. Each webhook endpoint gets its own secret — do not share secrets between endpoints.

What is the Auth0 webhook timeout?

Most providers timeout after 5–30 seconds. If your handler does slow operations (database writes, external API calls), respond with HTTP 200 immediately and process the event in a background job to avoid triggering Auth0's retry logic.