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When a Stripe integration behaves differently in production, check the middleware and dependency versions around it—not just the Stripe secret. Three version- and configuration-sensitive failure modes can explain the difference: Express parses a webhook body before signature verification, Express 4 does not automatically forward rejected async handlers, or Stripe API versions differ between outgoing requests and webhook events.
1. Stripe webhook signature verification fails in Express
What you see
Stripe reports a signature mismatch or your endpoint rejects a legitimate webhook after general JSON parsing is enabled. One possible error message is “No signatures found matching the expected signature.” That does not by itself prove the signing secret is wrong.
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Why it happens
Signature verification needs the original request payload. Express’s body-parsing middleware documentation distinguishes express.json(), which parses JSON, from express.raw(), which makes a Buffer available as the request body. Stripe’s webhook signature guidance likewise requires the unmodified payload for verification. If general JSON middleware consumes the stream first, the webhook verifier may no longer receive the original bytes in the expected form.
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Fix and verify
- Register the webhook route with raw-body handling before application-wide JSON parsing. Keep JSON parsing for the rest of the application.
- Pass the untouched body and the
Stripe-Signatureheader to the Stripe SDK’s verifier. Check the installed Express and Stripe SDK versions and confirm the middleware order for the exact route; do not assume one configuration fits every integration. - Send a Stripe test event through the same deployed middleware stack. Confirm signature validation succeeds and the endpoint returns the intended response.
A parser verify hook that preserves the raw Buffer is another possible approach; verify that the integration passes the exact original bytes to Stripe. Route-specific raw parsing isolates the exception more clearly, while either approach depends on correct ordering and implementation.
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2. Express async route works locally but crashes in production
What you see
A route succeeds normally, but a thrown error or rejected promise becomes an unhandled rejection, bypasses the expected error response, or causes a process failure. A difference between the local and deployed Express major versions can explain why the same handler behaves differently.
Why it happens
Express 4 does not automatically pass rejected promises from async handlers to next(). Express 5 does forward a rejected promise or an exception from a promise-returning route handler or middleware. The version in the deployed dependency tree—not just the version expected from local code—determines which behavior applies. See the Express error-handling guide.
Fix and verify
- Express 4: Catch failures and call
next(error), or use a maintained wrapper that forwards rejected promises. - Express 5: Rejected promises are forwarded automatically when the handler returns its promise. Your error middleware must still respond or pass the error onward.
- Both versions: Check the Express version in the production artifact and test a deliberate rejected promise in that runtime. Put error middleware after routes and ordinary middleware; its signature is
(err, req, res, next). It must end the response or pass the error along, or the request can hang.
Do not assume that an error is handled merely because the handler is declared async: in Express 4, the rejection must be forwarded explicitly.
3. Stripe webhook event API version differs from the SDK version
What you see
Webhook processing breaks after an SDK upgrade or an account-version change. Your code may expect fields or object shapes that do not match the event it receives.
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Why it happens
The Stripe Node SDK’s request API version and a webhook endpoint’s event API version are separate settings. Stripe’s API versioning documentation says stripe-node v12 and later align outgoing requests with the API version current when that SDK release was published, unless overridden. Webhook events use the version configured for the endpoint when it was created, or the Stripe account’s default version. Updating the SDK therefore does not necessarily change the version of events sent to an existing endpoint.
Fix and verify
- Record the API version used by the deployed Stripe client and the API version configured for each webhook endpoint.
- Make event parsing compatible with the endpoint’s event version, or deliberately change that endpoint’s version after testing.
- Test API-version changes before adopting them. Do not infer a webhook event’s version from the SDK version alone.
The current Stripe API version can change, so use the version shown in your account and deployment configuration rather than relying on a hard-coded “latest” version in a troubleshooting guide.
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Stripe idempotency key returns the same error
Idempotency is for retrying the same logical POST request after an ambiguous network failure; it is not a general-purpose retry switch. Stripe can return the first saved result—including a 500—for subsequent requests with the same key. Reusing a key with changed endpoint parameters produces an idempotency error. Use a stable key for retries of the same operation, and investigate a repeated error rather than assuming another request with that key will rerun it. Stripe documents these behaviors alongside error handling and rate-limit guidance.
Separate rate limits from application bugs
Stripe documents HTTP 429 as too many requests and recommends exponential backoff. A 429 points to rate limiting; it does not by itself show that an Express route or Stripe integration is defective.
Express trust proxy behind a load balancer
Express’s behind-proxies guide explains that trust proxy affects req.ip, req.hostname, and req.protocol using forwarded headers. Configure trust to match the actual proxy chain, and ensure the final trusted proxy overwrites client-supplied forwarded headers. An incorrect setting can make IP-based security decisions unreliable or interfere with HTTPS-aware behavior.
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