Webhook Validator — Payload & Signature Checker
Validate and inspect webhook payloads in your browser. Auto-detects GitHub, Stripe, Slack, and Shopify webhooks, extracts event details, and optionally verifies HMAC signatures. Free and private.
How to Use Webhook Validator — Payload & Signature Checker
How to Use the Webhook Validator:
Paste the Payload: Copy the raw JSON body of your webhook request and paste it into the payload field. The tool accepts any JSON object.
Click "Validate Webhook": The tool parses the JSON and attempts to identify the provider automatically based on the payload structure. Supported providers are GitHub, Stripe, Slack, and Shopify.
Review Event Details: For recognised providers, the tool extracts the event type, event ID, and provider-specific fields such as the repository name (GitHub), livemode flag (Stripe), team ID (Slack), or currency (Shopify).
Verify the Signature (optional): To verify that the payload has not been tampered with:
- Paste the signature header value into the "Signature Header Value" field (e.g. the full value of X-Hub-Signature-256 for GitHub, or X-Shopify-Hmac-Sha256 for Shopify).
- Enter your webhook signing secret.
- Click "Validate Webhook" again — the tool will compute the expected HMAC and compare it against the provided value.
Understand Signature Results:
- Verified: The computed HMAC matches the provided signature — the payload is authentic.
- Mismatch: The signatures differ — the payload may have been modified, or the wrong secret was used. The computed signature is shown for comparison.
- See note: Some providers (Stripe, Slack) sign a combined string that includes a timestamp from another header. Body-only verification is not supported for these; use the provider SDK or include the full signing string.
Notes:
- GitHub uses HMAC-SHA256 on the raw body with a "sha256=" prefix. Paste the full header value.
- Shopify uses HMAC-SHA256 on the raw body, base64-encoded (no prefix).
- Stripe uses HMAC-SHA256 on "<timestamp>.<body>" — direct body-only verification is not possible.
- Slack uses HMAC-SHA256 on "v0:<timestamp>:<body>" — direct body-only verification is not possible.
- Your payload and secret never leave your browser.
Frequently Asked Questions
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