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A webhook signature can fail even when the payload appears unchanged because verification checks bytes, not how parsed JSON looks. Capture the original request body before middleware parses or transforms it, verify it using the provider’s exact signature rules, and parse it only after verification succeeds.
Why matching JSON can produce a different signature
Webhook providers calculate signatures over a defined input, such as the request body’s contents or a timestamp combined with the body. Whitespace, key order, character encoding, and other byte-level differences can change that input without changing the JSON object you see.
For example, these JSON texts describe the same object but are not identical byte sequences:
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{"event":"created","id":42}{ "id": 42, "event": "created" }If your server parses the request and later serializes the object again, it may produce different bytes from those the provider signed. Verify the original body rather than a reconstruction. GitHub instructs developers to calculate the HMAC over the payload contents, while Slack says to use the raw request body before deserialization. GitHub’s webhook validation documentation and Slack’s request verification documentation describe their respective approaches.
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Debug the failure in this order
- Identify the provider and endpoint. Confirm which webhook integration is sending the request and which endpoint’s secret is configured. Secrets can differ across endpoints or environments, so check the configuration associated with the failing endpoint.
- Preserve the body before it is parsed. At the earliest point in your server’s request lifecycle, retain the original body bytes—or the exact raw representation required by the provider’s official SDK. Do not call JSON parsing middleware,
request.json(), or an equivalent operation first if it consumes or transforms the body. - Verify with the provider’s own rules. Use its official SDK or documented formula, signature header, algorithm, and encoding. Do not assume that another provider’s signing procedure applies.
- Parse only after verification succeeds. Once the signature passes, decode and parse the body for application logic. Reject or quarantine requests that fail verification according to your service’s error-handling policy.
- If it still fails, check the inputs and the route. Confirm the secret value, header name, algorithm, encoding, and whether another middleware or earlier body read changed or consumed the request. Check whether a proxy or load balancer alters the body or relevant headers.
- Compare safely and diagnose without leaking data. If implementing verification yourself, use a constant-time comparison function rather than ordinary string equality. Log which verification stage failed, but do not log signing secrets or expose sensitive payload contents.
Provider formats are not interchangeable
The shared principle is to verify the input the provider actually signed. The precise input construction, header, algorithm, output format, and replay protections are provider-specific.
| Provider | Documented signature details | Implementation point |
|---|---|---|
| GitHub | X-Hub-Signature-256 carries an HMAC-SHA256 hex digest with the sha256= prefix, calculated using the webhook secret and payload contents. |
GitHub’s examples verify the request body before parsing JSON. Its troubleshooting guidance also calls out a configured and correct secret, the SHA-256 header and algorithm rather than legacy X-Hub-Signature/HMAC-SHA1, possible proxy or load-balancer changes, and UTF-8 handling where the runtime specifies an encoding. |
| Slack | X-Slack-Signature is used with a signing secret and a timestamp header; the timestamp participates in Slack’s verification flow. |
Use the raw body before deserialization and check that the request is recent. The timestamp check helps protect against replay; do not carry Slack’s timestamp procedure over to another provider unless that provider documents it. |
See GitHub Docs: Validating webhook deliveries and Slack’s request verification guide for those provider-specific details. Exact framework APIs differ, so there is no universal raw-body code snippet: consult the documentation for your server framework and the provider’s current instructions.
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Use constant-time signature comparison
After calculating the expected signature, compare it with the supplied signature using a constant-time function. GitHub’s examples include Node.js crypto.timingSafeEqual and Python hmac.compare_digest. GitHub Docs cautions: “Never use a plain == operator.” See its signature validation guidance.
This comparison safeguard does not fix a wrong secret, changed body, or incorrect formula; it protects the comparison step once the right values have been computed.
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