An Introduction to Webhooks

Webhooks are a mechanism which enables communication between two applications or services where one service (client) is waiting for a response from the other (server). In case of webhooks, the server sends the response to the client when it is ready. This is an alternative to the polling approach where the client polls regularly to check if the operation has been completed.

Basically, webhooks enable one application to send automatic notifications or data to another application when a specific event occurs. Though not specifically an API, webhooks are also called “reverse APIs” or “push APIs”.

WebHooks Flow Diagram

WebHooks are not APIs but they work together. An application must have an API to use a webhook.

Advantages of Webhooks:

1. Eliminates needs for polling
2. Can be set up quickly - Client enters app’s webhook URL and basic parameters, like which event they are interested in in the server app’s UI.
3. Automate data transfer - Data transfer is initiated by server so happens as soon as the event happens.

Risks of WebHooks:

1. Security: Without proper security measures, malicious third party actors may be able to access sensitive data.
2. Data Integrity: Data is transferred over HTTP, which can be vulnerable to tampering.

Some examples of webhooks:

1. An E-Commerce website can use webhooks to notify another application when an order is placed.
2. An analytics application can use webhooks to receive data from another application that stores usage data.
3. Social media platforms make extensive use of WebHooks to notify users of new news, posts and updates.

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