Webhooks vs. Polling vs. WebSockets: Choosing the Right Pattern

When building integrations between systems, you have three main options for receiving updates: webhooks, polling, or WebSockets. Each has distinct advantages, and choosing the right one depends on your specific requirements.

Quick Comparison

Webhooks: Event-Driven Push

Webhooks push data to your server when events occur. The source system makes an HTTP request to your endpoint.

When to Use Webhooks

• Third-party integrations: Stripe, Shopify, GitHub all use webhooks
• Infrequent events: Order placed, user signed up, payment received
• Decoupled systems: Services that don't need constant communication

Webhook Advantages

// Simple webhook receiver
app.post('/webhooks/orders', async (req, res) => {
  const order = req.body;

  // Process immediately when event occurs
  await notifyWarehouse(order);
  await sendConfirmationEmail(order);

  res.status(200).send('OK');
});

• No wasted requests—only fires when something happens
• Works across firewalls (outbound only from sender)
• Easy to implement on the receiving side

Webhook Challenges

• Requires a publicly accessible endpoint
• Need to handle failures and retries
• No guarantee of delivery order

Polling: Simple but Costly

Polling repeatedly asks "is there anything new?" at regular intervals.

When to Use Polling

• No webhook support: The API doesn't offer webhooks
• Simple requirements: Small-scale, infrequent checks
• Firewall restrictions: Can't expose public endpoints

Polling Implementation

// Simple polling loop
async function pollForUpdates() {
  let lastChecked = new Date();

  setInterval(async () => {
    const updates = await api.getUpdates({
      since: lastChecked
    });

    for (const update of updates) {
      await processUpdate(update);
    }

    lastChecked = new Date();
  }, 30000); // Every 30 seconds
}

Polling Drawbacks

• Wasted resources: Most requests return empty
• Latency: Updates delayed until next poll
• Rate limiting: Too frequent polling gets blocked
• Cost: API calls often have usage limits

WebSockets: Real-Time Bidirectional

WebSockets maintain a persistent connection for instant, two-way communication.

When to Use WebSockets

• Live updates: Chat, gaming, collaborative editing
• High-frequency data: Stock tickers, live scores
• Bidirectional needs: User actions trigger server responses

WebSocket Implementation

// Server-side WebSocket
const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', (ws) => {
  ws.on('message', (message) => {
    // Handle incoming messages
    const data = JSON.parse(message);
    processClientMessage(data);
  });

  // Push updates to client
  broadcastUpdate = (update) => {
    ws.send(JSON.stringify(update));
  };
});

WebSocket Challenges

• Connection management complexity
• Scaling requires sticky sessions or pub/sub
• Not all infrastructure supports WebSockets
• Mobile networks can be unreliable

Combining Patterns

Real-world systems often combine approaches:

Webhooks + WebSockets

[Third-Party] → Webhook → [Your Server] → WebSocket → [Browser]

Receive webhooks from external services, then push to connected clients via WebSocket. This is exactly how HookWatch's real-time dashboard works.

Webhooks + Polling Fallback

// Primary: webhooks for real-time
// Fallback: polling to catch missed events
async function reconcile() {
  const webhookEvents = await db.getRecentEvents();
  const apiEvents = await externalApi.getEvents();

  const missed = apiEvents.filter(
    e => !webhookEvents.find(w => w.id === e.id)
  );

  for (const event of missed) {
    await processEvent(event);
  }
}

// Run reconciliation hourly
setInterval(reconcile, 60 * 60 * 1000);

Making the Decision

Choose Webhooks when:

• Integrating with third-party services
• Events are infrequent (< 1 per second per endpoint)
• You need reliable delivery with retries

Choose Polling when:

• The API doesn't support webhooks
• You can't expose public endpoints
• Update frequency is low and latency isn't critical

Choose WebSockets when:

• You need sub-second latency
• Communication must be bidirectional
• You're building real-time user-facing features

Why Webhooks Win for Most Integrations

For backend integrations, webhooks are usually the right choice. They're efficient, widely supported, and handle failure gracefully with retry mechanisms.

The challenge is making webhooks reliable. That's where HookWatch comes in—providing the infrastructure to ensure every webhook is received, logged, and delivered, with automatic retries when things go wrong.