Webhook & API Payload Tester
Paste a raw JSON payload to inspect its structure in a readable table.
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.
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.