~$ man webhook
What is a webhook?
definition
A webhook is an automated HTTP POST request sent to a predefined URL when a specific event occurs in the source application.
It enables event-driven communication instead of clients repeatedly polling an API for updates.
Webhooks are widely used for notifications, data synchronization, and connecting services such as payment gateways or version control systems.
A webhook works like a doorbell: when a package arrives the bell rings once to tell you, instead of you opening the door every few minutes to look outside.
key takeaways
- Webhooks deliver data via HTTP callbacks to a registered endpoint URL.
- They eliminate constant polling and reduce server load and latency.
- Payloads usually contain event details in JSON format.
- Endpoints must be publicly reachable and able to handle retries.
- Verification uses shared secrets or digital signatures to confirm authenticity.
the 2026 job market
By 2026 event-driven architectures and SaaS integrations continue to expand, increasing demand for backend and integration engineers who can design, secure, and maintain reliable webhook systems across distributed services.
frequently asked questions
How does a webhook differ from an API call?
An API call is initiated by the client to fetch data on demand. A webhook is initiated by the server to push data automatically when an event occurs.
What happens if a webhook delivery fails?
Providers typically retry the request several times using exponential backoff. Applications should also implement idempotency keys to process duplicate deliveries safely.
How can I test a webhook locally?
Use tools such as ngrok or localtunnel to expose your development server through a public URL that the webhook provider can reach.
Which programming languages are commonly used with webhooks?
Any language with an HTTP server works; Node.js, Python with Flask or FastAPI, and Go are frequent choices for handling incoming webhook payloads.
courses to go further
