Dev Tools

Webhook Payload Builder

Create realistic webhook JSON request bodies with nested fields, event metadata, timestamps, and copy-ready headers for local testing and docs.

Path syntax

Use dots for nested objects like data.object.id and [] for arrays like data.tags[].

Event settings

Payload fields

Generated JSON payload

{
  "id": "evt_123",
  "type": "payment_intent.succeeded",
  "createdAt": "2026-04-15T10:00:00.000Z",
  "data": {
    "object": {
      "id": "pi_123",
      "amount": 2499,
      "currency": "usd",
      "status": "succeeded"
    }
  }
}

Suggested headers

content-type: application/json
stripe-signature: t={timestamp},v1={signature}
stripe-event-id: del_123

Useful for

  • • Mocking provider webhooks during local dev
  • • Creating docs and API examples
  • • Testing event parsing logic before production events exist
  • • Pairing with Webhook Signature Tester for full end-to-end samples

Tips

  • • Use [] at the end of a path to append array items
  • • Number and boolean types are converted automatically
  • • Null fields ignore the value input
  • • Nested object paths are created automatically

Privacy

Everything runs in your browser. No payload data is uploaded by this tool.

What Is a Webhook Payload Builder?

A webhook payload builder is a tool that lets you construct realistic webhook JSON request bodies without waiting for a real provider event to fire. Webhook-driven integrations depend on receiving structured event data — a Stripe payment_intent.succeeded object, a GitHub push event, or a custom SaaS notification — but triggering those events in a real environment during development is slow, unreliable, or impossible.

This tool lets you compose any JSON payload using dot-notation paths, choose field types (string, number, boolean, null), and instantly see the full structured output alongside provider-appropriate HTTP headers — all in the browser with no backend required.

How to Build a Webhook Payload Online

  1. 1 Choose a preset — click the Stripe preset for a payment-intent-style payload, or Generic for a simple user-created event. The preset fills in the event name, ID, delivery ID, timestamp, and a set of example fields.
  2. 2 Adjust event metadata — edit the event name (e.g. user.subscription.cancelled), event ID, and delivery ID to match the naming conventions of your target provider.
  3. 3 Define payload fields — each field has a path, a type, and a value. Use dot notation for nested objects (data.object.amount) and append [] to a path for array items (data.tags[]). Add as many fields as needed.
  4. 4 Review the generated JSON — the output panel shows the fully structured payload in real time. Nested objects and arrays are assembled automatically from the path definitions.
  5. 5 Copy payload and headers — use the Copy buttons or Download to save the JSON file. The Suggested Headers panel shows the correct Content-Type, event type, and delivery-ID headers for the selected provider style.

Common Use Cases

Local webhook development

Build and test your webhook handler before real events exist. Craft the exact shape of the JSON body your code expects, copy it, and send it with curl or a tool like Insomnia to your local endpoint.

End-to-end signing tests

Pair with the Webhook Signature Tester to generate a payload here, compute its HMAC signature, and verify your handler correctly validates both the body and the header — all without a live provider.

Writing API documentation

Generate realistic example payloads for technical docs, onboarding guides, or Postman collections. Adjust field names and values to reflect production data shapes without exposing real customer records.

Mocking Stripe webhook events

Reproduce specific Stripe scenarios — charge failures, subscription cancellations, payout arrivals — by building the exact nested payload structure Stripe would send, without needing a Stripe test-mode event.

Testing event parsing logic

Validate that your parser correctly handles edge cases: null fields, boolean flags, deeply nested objects, and array values. Build each scenario as a distinct payload and test systematically.

Prototyping new webhook integrations

When designing a webhook sender for your own SaaS, use this tool to iterate on the payload schema before committing to a format. Share the output with frontend or ops teams for feedback.

Frequently Asked Questions

How do I create nested fields in the payload?

Use dot notation in the Path column. For example, entering data.object.amount with value 2499 and type number will produce a nested data.object object containing an amount property.

How do I add array values?

Append [] to the path. Adding multiple fields with the path data.tags[] will produce an array at data.tags with one item per field row.

What is the difference between Stripe-style and Generic provider?

Stripe-style adds the top-level id, object, type, and created envelope fields and generates Stripe-Signature-style headers. Generic produces a simpler envelope with event, id, and timestamp and standard X-Webhook-Event headers.

Can I use this to send real webhooks?

This tool generates the payload and headers only — it does not make HTTP requests. Copy the JSON and headers and use curl, Postman, or Insomnia to POST them to your endpoint. For example: curl -X POST -H "Content-Type: application/json" -d @webhook-payload.json http://localhost:3000/webhook.

Are number and boolean values converted automatically?

Yes. When you select type number, the value is parsed to a JSON number. Selecting boolean converts true or false to a JSON boolean. Selecting null ignores the value field entirely and outputs null.

Is my data sent anywhere?

No. All payload construction happens entirely in your browser using JavaScript. No field values, paths, or generated JSON are transmitted to any server.

Can I combine this with the Webhook Signature Tester?

Yes — this is the recommended workflow. Build your payload here, copy the JSON body, then paste it into the Webhook Signature Tester to generate and verify an HMAC signature against a shared secret. This gives you a complete, testable webhook request in minutes.