Webhook Payload Builder

About this tool

Create a sample webhook request, a JSON payload and a curl command, that you can send to your own endpoint to test how it handles incoming webhooks.

Example

Input: url + payload

Output: curl -X POST webhook ...

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Enter your webhook target URL, such as a local endpoint or a staging endpoint that accepts POST requests.
2. Add the fields you want to test in the JSON payload, such as event type, resource id, and timestamp.
3. Generate the sample request to get both a JSON body and a curl command you can paste into a terminal.
4. Send the request to your endpoint and check how your app handles the incoming webhook.

Step by step, what happens

1. The tool takes the webhook URL and the payload fields you provide.
2. It builds a JSON request body that matches a typical webhook POST payload.
3. It formats a curl command that sends a POST request with the JSON body and the right content type.
4. You copy the output into your terminal or test client and use it to verify your handler, logging, and error handling.

Worked example

You want to test a local order-created webhook handler before connecting a real payment provider.

Input: POST https://localhost:3000/webhooks/orders {"event":"order.created","order_id":"ord_123","status":"paid"}

1. The tool reads the POST URL and the JSON fields you want in the payload.
2. It turns the input into a webhook request body with the same fields.
3. It generates a curl command that posts that JSON to https://localhost:3000/webhooks/orders.

Tips and common mistakes

• Use an endpoint that can accept POST requests and return useful logs, so you can see the exact body your app receives.
• Keep the sample payload close to the real webhook shape your integration will send, including the field names your handler expects.
• If your local server uses HTTPS with a self signed certificate, your curl command may need extra options to trust it during testing.
• Make sure your endpoint can handle missing or extra fields, because real webhook providers often add metadata you did not include in the sample.

Frequently asked questions