Webhooks vs. Polling: Real-time communication for APIs

Introduction

In the world of API-integration the question frequently arises: how do I experience when something changes?

The two basic approaches are Polling (the client regularly asks) and Webhooks (the server informs the client).

Both have their permission – the choice depends on your specific application.

What is polling?

During polling, the client sends requests to the server at regular intervals to ask for new data or changes.

It is the simpler pattern, but not always the most efficient.

// Polling Example (all 30 seconds) setInterval(async) => { const response = waiting fetch('/api/orders?since=lastCheck'); const newOrders = waiting response.json(); processOrders(newOrders); }, 30000;

What are Webhooks?

Webhooks reverse the communication pattern. The server actively sends an HTTP request to a URL defined by the client as soon as a relevant event occurs.

The client must provide an endpoint that can receive these notifications.

// Webhook receiver (Express.js) app.post('/webhooks/orders', (req, res) => const event = req.body; if (event.type == 'order.created') { processNewOrder(event.data); } res.status(200).send('OK'); });

Polling advantages

Webhooks vs. Polling: When what method?

Leaders exploring Webhooks vs. Polling: Real-time communication for APIs can use Cost Calculator: API Development, Solution: Integration Chaos, RPA vs. API Integration sowie System Integration as structured entry points.

• Easy rollout

• Client keeps control

• No public URL required

• Works behind firewalls

Webhooks - advantages

• Real-time notifications

• Resource efficiency

• No unnecessary requests

• Scales better

Decision aid

CriterionPollingWebhooks

Latin demandTolerant (seconds/minutes)Critic (real time) Event frequencyHigh and predictableSold and unpredictable InfrastructureOnly client necessaryPublic endpoint needed ReliabilityClient-controlledRetry logic required

Conclusion

Short: In practice, a combination of both approaches is often best.

In practice, a combination of both approaches is often best. Webhooks for real-time notifications, supplemented by polling as fallback for missed events.

Modern APIs like Stripe and GitHub offer both options.

Do you need help with the implementation?

We support you in choosing and implementing the right communication pattern. Contact us!

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References and further reading

The following separate references complement the topics in this article:

• Bitkom – German digital industry association.
• German Federal Office for Information Security (BSI).
• European Commission – Digital strategy.
• MDN Web Docs (Mozilla)
• W3C – World Wide Web Consortium.

> "ERP programmes rarely fail on software selection; they fail on unclear process ownership."

— Björn Groenewold, Managing Director, Groenewold IT Solutions

Frequently Asked Questions (FAQ)

What is this article about: “Webhooks vs. Polling: Real-time communication for APIs”?

This article sums up practical aspects of Webhooks vs. Polling. Real-time communication for APIs for leaders and delivery teams. In short: Webhooks vs. Polling: When what method?

Comparison of real-time communication patterns for APIs with benefits and disadvantages as well as rollout tips.

Who benefits most from the content described here?

It is especially relevant for firms in Interfaces that need reliable systems, clear interfaces, and predictable delivery — from mid-market teams to expert departments.

How does this topic fit into an IT or digital strategy?

You can map the topic to service building blocks such as custom software and delivery support. Architecture reviews and stepwise rollout reduce risk and rework.

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