Free Webhook Testing Tools Comparison

// Create inbox, send test webhook, inspect results

// Step 1: Create inbox
const inbox = await fetch(
  'https://agent-gateway-kappa.vercel.app/v1/webhook-inspector/new',
  { method: 'POST', headers: { 'Content-Type': 'application/json' } }
).then(r => r.json());

console.log('Webhook URL:', inbox.url);

// Step 2: Send a test webhook
await fetch(inbox.url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-Event': 'order.completed'
  },
  body: JSON.stringify({ orderId: 12345, amount: 99.99 })
});

// Step 3: Inspect captured requests
const data = await fetch(
  `https://agent-gateway-kappa.vercel.app/v1/webhook-inspector/api/inbox/${inbox.id}/requests`
).then(r => r.json());

console.log('Captured:', data.requests.length, 'requests');
console.log(data.requests[0].headers);
console.log(data.requests[0].body);

import requests, json

# Step 1: Create inbox
inbox = requests.post(
    "https://agent-gateway-kappa.vercel.app/v1/webhook-inspector/new",
    headers={"Content-Type": "application/json"}
).json()

print(f"Webhook URL: {inbox['url']}")

# Step 2: Send a test webhook
requests.post(inbox["url"], json={
    "orderId": 12345,
    "amount": 99.99
}, headers={"X-Event": "order.completed"})

# Step 3: Inspect captured requests
data = requests.get(
    f"https://agent-gateway-kappa.vercel.app/v1/webhook-inspector/api/inbox/{inbox['id']}/requests"
).json()

for req in data["requests"]:
    print(f"{req['method']} {req['path']} - {req['headers']}")
    print(f"Body: {req['body']}")

// Webhook.site requires browser-based URL creation on free tier
// API creation is paid ($9/mo) — use Frostbyte for free API access

// Send a webhook to your Webhook.site URL:
await fetch('https://webhook.site/your-unique-id', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    event: 'order.completed',
    data: { orderId: 12345 }
  })
});

// View results at https://webhook.site/#!/your-unique-id

// Local webhook handler + ngrok tunnel
import express from 'express';
import ngrok from '@ngrok/ngrok';

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

app.post('/webhook', (req, res) => {
  console.log('Headers:', req.headers);
  console.log('Body:', req.body);
  res.json({ received: true });
});

app.listen(3000, async () => {
  const url = await ngrok.connect(3000);
  console.log(`Webhook URL: ${url}/webhook`);
});