What this tool does
Webhook Tester builds test requests, validates JSON payloads, sends browser requests when possible, and generates copyable curl commands.
← All ToolsCORS limitation. Many webhook endpoints receive the request but block the browser from reading the response. Use the generated curl command when browser fetch is blocked.
🪝 Webhook Tester
Send browser test requests when CORS allows it, validate payloads, and copy equivalent curl commands.
Why it is useful
It helps developers debug webhook payload shape and request setup before wiring production automation.
How it works
The browser parses headers and JSON, then either sends a fetch request or builds an equivalent curl command.
Best input
Use public development endpoints and redacted payloads.
Security tip
Never paste production signing secrets or real customer payloads into a web tool.
Privacy note
Payload editing happens locally. Browser requests are sent directly to the URL you enter.
Important limitation
Browser CORS may block response visibility even when the endpoint receives the request.
Quick answers
Does this receive real webhooks?
No. It sends test requests and builds commands; it is not a webhook inbox.
Why did fetch fail but curl works?
Browsers enforce CORS; curl does not.
Common Use Cases
Build a Stripe-style test payload
Draft a redacted event body and headers, then copy curl for a local tunnel or staging endpoint.
Debug CORS before blaming the webhook
Send a browser request when allowed and fall back to the generated curl command when the response is blocked.
Validate JSON before wiring automation
Catch malformed payloads or header formatting issues before adding the request to a workflow tool.
HTTP Developer Workbench workflow
Move between curl conversion, webhook testing, status-code reference, typed HTTP security diagnostics, redirect-chain analysis, status samples, MIME lookups, and user-agent parsing while keeping network behavior explicit.