Simulation Parameters
Define the payload and headers to "send" to the local inspector.
Local Inspector
What is the Webhook Tester?
The Webhook Tester is a client-side simulation utility developed to test and inspect webhook HTTP requests and payload schemas. By configuring mock request headers, choosing HTTP methods, and inputting body payloads, developers can inspect request processing behaviors directly in their browser.
This tester operates entirely on the client side, using local JavaScript logic to simulate request parsing and print logs. Since no server URLs are hosted, no public ports are mapped, and no JSON inputs are sent over the network, your API structures and secret tokens remain private.
How to Use the Webhook Tester
- Select HTTP Method: Choose the desired request verb (like POST, GET, PUT, PATCH, or DELETE) from the method dropdown menu.
- Configure Headers: Add required webhook headers (such as
Content-Typeor authentication keys) using the key-value rows. Click "Add Header" for additional inputs. - Input Your JSON Payload: Paste the mock payload data into the "JSON Payload" textarea.
- Simulate Delivery: Click the "Simulate Webhook Delivery" button to process your mock request locally.
- Verify the Console Logs: Inspect the "Event Console" output to review formatted JSON hierarchies, method parameters, and header keys. Click "Clear History" to clear the logs.
Key Features
- Multi-Method Selections: Support for POST, GET, PUT, PATCH, and DELETE request configurations.
- Custom Header Dictionary: Dynamically add key-value rows to simulate service authentication hashes and Content-Type variables.
- Formatted JSON Outputs: Pretty-prints and validates body payloads in the console to trace nested keys.
- Visual History Console: Lists simulated event deliveries chronologically for easy comparison.
- 100% Secure Audits: Runs entirely in your browser sandbox without requiring public endpoints.
Common Use Cases
- Payment Notification Audits: Simulates webhook payloads from payment services (like Stripe or PayPal) to verify transaction parameters.
- Repository Event Testing: Test payload structures from version control platforms (such as GitHub or GitLab) for push events.
- E-commerce Schema Mapping: Verify shopping cart update payloads from e-commerce providers before writing integration logic.
- API Header Verifications: Replicate API signature validation headers to test header parsing algorithms.
Frequently Asked Questions
No. This tool is a client-side simulator. It does not open public HTTP endpoints or host temporary URLs. It is designed for manual testing where you input payload details to verify formatting and schemas.
No. All simulation parsing, header mapping, and log formatting are executed locally in your browser memory. Your data contracts are never sent to external servers.
Yes. The simulator parses the payload input locally. If it contains invalid JSON syntax, the console output will display a parsing warning.
Yes. You can add as many header rows as you need to simulate complex security schemes, API tokens, and custom metadata fields.
🔒 Privacy & Data Note: Webhook simulations, header parsing, and event logs are executed locally in your browser. No external connections are established.