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API vs. Webhooks

APIs and webhooks are two common ways for applications to communicate with each other. The main difference is who initiates the communication. An API is typically used when your application needs to request information or perform an action. A webhook is typically used when another system needs to notify your application that something has happened.

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APIs

An API (Application Programming Interface) allows your application to communicate with another application by sending requests to specific endpoints. With an API, your application is the one that initiates the request. For example, your application might send a request to retrieve the latest threads:
The API processes the request and sends a response back to your application.

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Typical API flow

APIs are useful when you need to:
  • Retrieve data.
  • Create, update, or delete data.
  • Trigger an action.
  • Control when a request is made.

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Webhooks

A webhook is a mechanism that allows one application to automatically send information to another application when a specific event occurs. With a webhook, the receiving application does not need to repeatedly ask whether something has changed. Instead, the system that owns the event sends a request to a URL that you provide. For example, when a new event occurs, RevReply could send a request to your webhook URL:
The request can contain information about the event that occurred.

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Typical webhook flow

Webhooks are useful when you need to:
  • Receive notifications about events.
  • React to changes in real time.
  • Avoid repeatedly polling an API for updates.
  • Trigger automated workflows when something happens.

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Key differences

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API or webhook?

The choice depends on what your application needs to do. Use an API when your application needs to actively request data or perform an action. For example, use an API when you want to retrieve the latest threads at a specific point in time. Use a webhook when your application needs to be notified automatically when something happens. For example, use a webhook when you want your application to react as soon as a new event is available. In many integrations, APIs and webhooks are used together. A webhook can notify your application that an event occurred, and your application can then use an API to retrieve additional information or perform a follow-up action.

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Simple example

Consider an application that needs to keep track of new threads. With an API, your application could periodically ask:
With a webhook, the system could notify your application:
Your application could then use the API to retrieve the thread details. This combination allows webhooks to provide timely notifications while APIs provide a way to retrieve or manipulate the underlying data.