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When a Stripe integration behaves differently in production, check the deployed middleware order, Express major version, and API-version settings before changing application logic. These three boundaries can make legitimate webhook requests fail, let rejected routes escape error handling, or deliver event objects in a shape the code does not expect.
1. Stripe webhook signature verification fails in Express
What you see
A webhook endpoint rejects legitimate Stripe events after deployment, sometimes with an error such as “No signatures found matching the expected signature.” The signing secret may be correct: the request body may have been parsed before verification.
Why it happens
Stripe verifies a signature against the original request payload. Express’s express.json() parses JSON requests, while express.raw() supplies the request body as a Buffer. If general JSON middleware runs first and consumes or transforms the body, the webhook verifier may no longer receive the original bytes it needs. See Stripe’s webhook signature guidance and Express’s body-parser documentation.
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Register raw-body handling for the webhook route before application-wide JSON parsing. Pass the untouched body and the Stripe-Signature header to the Stripe SDK’s verifier; keep JSON parsing for ordinary routes. The precise configuration depends on your installed Express and Stripe SDK versions, so check their documentation rather than copying a snippet without verifying its assumptions.
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app.post('/webhook', express.raw({ type: 'application/json' }), webhookHandler);
app.use(express.json());Here, webhookHandler must pass the raw Buffer from req.body and the signature header to the SDK verification method. Do not parse and re-serialize the body first.
Verify it in the deployed stack
- Confirm the production artifact’s Express and Stripe SDK versions.
- Check that the webhook route’s raw-body middleware is registered before any general JSON parser that would handle that request.
- Send a Stripe test event through the same deployed middleware path. Confirm that signature validation succeeds and that the endpoint returns its intended response.
2. An Express async route works locally but fails in production
What you see
A route succeeds when its awaited work resolves, but a rejected promise becomes an unhandled rejection, bypasses the expected error response, or causes a process failure. A difference between the Express major version in development and the one in the production artifact can explain the change.
Why the Express major version matters
Express 4 does not automatically pass rejected promises from async handlers to next(). Express 5 does forward a rejected returned promise, or an exception thrown by an async handler, to error handling. Express documents both behaviors in its error-handling guide.
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| Deployed version | Rejected async handler | What to do |
|---|---|---|
| Express 4 | Not automatically forwarded to next() |
Catch the error and call next(error), or use a maintained wrapper that forwards rejected promises. |
| Express 5 | A rejection from a returned promise is automatically forwarded | Ensure the promise reaches Express and that error middleware responds or passes the error onward. |
Fix and verify error propagation
For Express 4, wrap awaited work in try/catch and pass failures to next(error), or use a maintained async-handler wrapper. For Express 5, confirm the handler returns its promise; promise rejection forwarding is not a substitute for properly configured error middleware.
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Express error middleware has the signature (err, req, res, next) and belongs after routes and ordinary middleware. It must end the response or pass the error onward; otherwise, the request can hang.
- Check the Express version in the production dependency tree and deployed artifact, not only your local environment or a different lockfile.
- Exercise a route that deliberately rejects a promise in the deployed runtime.
- Confirm that the request reaches the expected error middleware and receives a response.
3. Stripe webhook event API version differs from the SDK’s version
What you see
Webhook processing breaks after an SDK upgrade or an account-version change. Code may expect fields or object shapes based on a different API version from the one used to create the event.
Why the versions can drift
The Stripe Node SDK’s outgoing request version and the API version attached to webhook events are separate settings. Stripe’s versioning documentation says stripe-node v12 and later align outgoing requests with the API version current when that SDK version was released, unless overridden. Webhook events use the version configured for their endpoint when it was created, or the account’s default version. Consequently, upgrading the SDK does not necessarily change the version of events from an existing endpoint. See Stripe’s API versioning documentation.
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- Record the API version used by the deployed Stripe client and the version configured for each webhook endpoint.
- Make event parsing compatible with the endpoint’s event version, or deliberately upgrade the endpoint after testing the resulting payload changes.
- Test API-version changes before adopting them in production, as Stripe recommends.
Do not infer a webhook event’s version from the SDK version alone. Stripe’s current API version can change, so consult the versioning documentation when planning an upgrade rather than hardcoding an unverified “latest” value.
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Stripe idempotency key returns the same error
An idempotency key is for retrying the same logical POST operation after an ambiguous network failure, not a general-purpose retry switch. Stripe saves the first result for a key—including a 500 response—and returns that result on subsequent requests using the same key. Reusing a key with changed endpoint parameters causes an idempotency error. Use a stable key for the same operation, and use a new key only for a genuinely new operation. See Stripe’s idempotent request guidance.
Distinguish rate limiting from an Express bug
A Stripe 429 response means too many requests; Stripe recommends exponential backoff. It does not, by itself, show that Express middleware or error propagation is at fault. See Stripe’s rate-limit guidance.
Express trust proxy behind a load balancer
Express’s trust proxy setting affects req.ip, req.hostname, and req.protocol using forwarded headers. Configure it to match the actual proxy chain, and ensure the final trusted proxy overwrites client-supplied forwarded headers. An incorrect trust setting can make IP-based decisions misleading or disrupt HTTPS-aware behavior. See Express’s behind-proxies guide.
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