Dev
Webhook Payload Generator
Webhook handlers need to parse an event id, route on the event type, extract nested data, and handle retries idempotently — all before a real provider ever sends a live event to your endpoint. This generator produces realistic JSON webhook payloads with the structure most providers use: a top-level id (evt_ prefix), a type field naming the event, a Unix timestamp in the created field, and a data.object containing the resource id, status, and amount. The event type dropdown selects which event to generate: payment.succeeded, user.created, order.shipped, subscription.cancelled, or random. Each payload uses the event type to set the resource type prefix on the data object id (e.g., payment_abc123 for a payment event) and the status field reflects the event verb. The amount field is a floating-point value in dollars. A practical workflow: copy the generated payload, POST it to your webhook handler endpoint using curl or Postman, and verify that your code parses the id, routes on the type, and processes the data correctly. Test with two payloads that share the same id to verify your idempotency logic rejects the duplicate.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Choose an event type, or leave it on random.
- Click Generate to produce a webhook payload.
- POST it to your handler endpoint or paste it into a test.
- Adapt the structure to match your provider's schema.
Use Cases
- •Developing and testing webhook handlers locally
- •Stubbing webhook events in integration tests
- •Documentation showing example event payloads
- •Verifying validation and idempotency logic
- •Replaying event types without a live provider
Tips
- →Test malformed and unexpected payloads, not just well-formed ones.
- →Make your handler idempotent using the event id to detect duplicates.
- →Match the payload shape to your real provider before relying on it.
- →Verify signature checks separately, since generated payloads are unsigned.
FAQ
what is a webhook payload
A webhook payload is the JSON body a provider POSTs to your endpoint when an event occurs. It typically carries an event id, a type that names what happened, a timestamp, and a data object with the details. Your handler parses this payload and acts on it.
why generate payloads instead of waiting for real events
Real providers fire events on their own schedule, which makes them slow and awkward to develop against. Generating realistic payloads lets you POST events to your handler on demand, in a fast, repeatable loop, long before the integration is live.
should my handler be idempotent
Yes — most providers deliver events at least once and may resend on retries, so processing the same event twice must not cause harm. Use the event id in the payload to detect and ignore duplicates, which is a key behaviour to test with generated payloads.
does the generated payload match Stripe's or GitHub's actual webhook format
The payload uses a common structural pattern — top-level id, type, created, and data.object — inspired by Stripe's event format, but it is not a drop-in replacement for a specific provider's schema. Field names, nesting, and additional metadata vary by provider. Use the generated payload as a development scaffold and adapt the structure to match your provider's documented format before going live.
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