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Webhook & API Payload Tester

Paste a raw JSON payload to inspect its structure in a readable table.

Raw JSON Payload

Paste a webhook or API payload above to inspect its structure.

Supports Stripe, HubSpot, GitHub, or any JSON payload.

About Webhook & API Payload Tester

Instant Parsing

Paste any JSON payload from Stripe, GitHub, HubSpot, or custom webhooks — see its structure in a clean table instantly.

Type Inspection

Each field is labeled with its data type (string, number, boolean, object, array) so you can validate payload schemas at a glance.

100% Private

Everything runs in your browser. No payload data is ever sent to a server — safe for sensitive API keys and production data.

All parsing happens locally in your browser using the native JSON.parse API. No data leaves your machine.

How Webhook Tester Works in Your Browser

The ToolsForgess webhook tester generates a temporary endpoint URL that captures and displays incoming HTTP requests with full header, body, and metadata inspection. Configure a webhook in your application to point at the generated URL, trigger the webhook, and view the complete request payload in real time. The tool uses the browser's EventSource API for server-sent events or polls a temporary endpoint to display incoming requests — all without storing any request data on external servers. This tool is essential for developers debugging webhook integrations, testing payment gateway callbacks, verifying notification system payloads, and inspecting API gateway forwarding behavior without setting up a dedicated webhook receiver server.

Key Features

  • Generate a unique temporary endpoint URL for webhook testing. Each URL captures incoming requests for inspection without requiring server infrastructure.
  • Display complete request details including HTTP method, headers, query parameters, and body content. Inspect JSON, form-data, and raw payload formats.
  • View request history in chronological order. Each incoming webhook is listed with timestamp, method, and content type for quick reference.
  • Request data is displayed in the browser without persistent storage. No webhook payloads are retained on external servers after the session ends.

Frequently Asked Questions

How long does the test URL remain active?
Test URLs are temporary and valid for the duration of your browser session. Close the tab or navigate away to invalidate the endpoint. New URLs are generated on each visit.
Can I test webhooks from external services?
Yes. Copy the generated URL and paste it into your webhook configuration. External services can send requests to the URL and the payload will appear in the viewer.
Does it support authentication headers?
The tool displays all incoming headers including Authorization, Bearer tokens, and custom authentication headers. Verify that your webhook provider sends the correct authentication credentials.
Is my webhook data stored?
Webhook payloads are displayed in the browser and not stored on external servers. Data exists in memory during the active session only.

All data processing for Webhook Tester runs 100% locally in your browser using client-side JavaScript. No data is uploaded to any server.

Technical Specification

HTTP Webhook Testing & Payload Inspection Engine

Overview

The ToolsForges Webhook Tester provides a local webhook endpoint that captures, inspects, and replays incoming HTTP requests for debugging integrations, testing payment notifications, and validating API callback URLs. Generate a unique test URL, configure expected headers and payload formats, then trigger requests from your service to see the full request details displayed in real time. The tool records request method, headers, body, query parameters, and timestamps for comprehensive webhook debugging. All captured data remains in your browser session with no server-side storage of webhook payloads.

Feature Specifications

  • Unique Test Endpoint GenerationGenerate a unique, temporary webhook URL that captures incoming requests. Each URL is session-scoped and isolated from other users for private, secure webhook testing.
  • Full Request InspectionView complete request details including HTTP method, headers, body content, query parameters, and source IP for comprehensive payload analysis and debugging.
  • Request History and ReplayBrowse captured requests in chronological order and replay individual requests to test your handler's response to the same payload multiple times.
  • Payload Format ValidationValidate incoming webhook payloads against expected JSON schemas or format patterns, identifying missing fields, incorrect types, or malformed data structures.

Architecture

The webhook tester uses the browser's Service Worker API or a local relay to capture incoming HTTP requests. Request data is stored in IndexedDB for session persistence and rendered in a real-time updating request log panel.

Frequently Asked Questions

Is the webhook URL publicly accessible?

Yes, the generated URL must be accessible from your service or API provider to receive webhook triggers. However, captured data is only visible in your browser session.

How long are webhook requests retained?

Captured requests persist for the duration of your browser session. Clearing browser data or closing the tab removes all stored webhook payloads.

Can I test webhook authentication?

The tool displays all incoming headers including authorization headers, HMAC signatures, and custom authentication tokens for inspection and validation.

Is my webhook data stored?

Captured webhook payloads are stored in your browser's IndexedDB during the active session only. No data is transmitted to external servers or persisted beyond the session.