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Webhooks: A basic explanation with examples

Samuel K Itotia by Samuel K Itotia
March 6, 2025
Reading Time: 3 mins read
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webhooks

Webhooks make extensive use of fundamental API call techniques and enable event triggers with a few clicks of a button, all without the burden of complex request-response structures.

From system failures to trade and stock alerts, current software cannot afford to wait for a polling procedure or a nightly update. Webhooks are one technique to link systems by sending a sequence of near-instant message updates, each related to a separate event.

This article describes the fundamental method and concepts of how webhooks function, including how they vary from APIs, and then provides some real-world instances of webhooks in operation.

What is a webhook?

A webhook is a callback technique in which one software system utilizes APIs to immediately inform another of an occurrence. That is, one application may send a web-based message request whenever a qualifying event occurs. To utilize webhooks successfully, the notification system must be able to register events and attach them to a URL. When a certain event occurs, such as a purchase order on a trading desk, the URL is called over the web with the event’s payload.

The API (in the form of the updated URL) will then inform the second system. This reverses the API concept: instead of requesting something, the platform just delivers its request message. The message and destination are totally customizable, needing just a user-supplied recipient web address.

The word “webhook” refers to sending an event to another system using a web API. When an event occurs, webhooks send HTTP POST messages to another application, triggering actions. The current typical data format for this is JSON; however, a webhook system may be built using SMS or SMTP events. To do this, developers may write command lines, configure files, or route data directly via a user interface.

Webhook examples

A webhook requires two components: a sender and a receiver. The sender must be set up to identify when an event has happened. It may then inform the event to the receiver, which is an application that has an API to send messages to. Webhooks are a simple method for sending text-based answers to users when certain events occur inside an application. Most current services, including Gmail, Slack, Discord, GitHub, and Google Calendar, allow webhooks or have a comparable architectural approach.

Some real-world instances of webhooks are as follows:

  • Instagram photographs are automatically uploaded to X, previously known as Twitter.
  • A linked doorbell that is programmed to flash certain lights within a house when it rings.
  • Creating a Slack/webhook to alert teams of important updates.
  • Adding GitHub update alerts to Discord conversations as messages.
  • Creating a Microsoft Teams channel to convey messages when individuals purchase or sell certain stocks.

Webhooks are an event-based communications method, while APIs react to queries. As a result, when anything occurs, the webhook will contact the API of the downstream system.

For example, suppose a developer maintains a Discord channel for a GitHub project and wants an automatic message to notify the channel of any new code modifications in the public repository. By utilizing Discord’s channel integration options to establish a webhook, GitHub will not only send an automatic message to the channel in response to certain specified events, but it will also be configured as a link to a page containing the specifics of the modification.

Conclusion

Webhooks are important in current software integration because they allow for near-instantaneous alerts across systems. They successfully supplement standard APIs by providing a simpler approach to event-driven communication. Webhooks, with their easy setup and vast variety of uses, have become a vital tool for developers aiming to establish smooth and responsive interactions across platforms. Webhooks, whether used to automate social media updates, improve security with smart home devices, or streamline project management processes, provide a flexible option for real-time event handling in today’s linked world.

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Samuel K Itotia

Samuel K Itotia

IT Project Consultant, Bachelor of Computer Science holder, Microsoft Certified IT Professional. Certified Google Apps Cloud Deployment specialist and Trainer. Passionate on the new trends of Technology. He will always share it with the world.

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