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To reconstruct a tenant incident in Next.js, first identify whether the request ran through a Server Action, an App Router Route Handler, or a Pages Router API route. Then connect its framework error context to server-validated identity, tenant selection, authorization decisions, deployment identity, and a deliberate correlation ID. Next.js provides instrumentation and request-error hooks, but your application must define tenant-aware logging, redaction, and retention.
Identify which Next.js execution path ran
“API route” can mean different things in a Next.js application. Establish the router and concrete file or action involved before interpreting an error; the execution path determines which framework context is available and where to inspect the application’s authorization logic.
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| Execution path | How to recognize it | Incident detail to establish |
|---|---|---|
| Server Action | A Server Function used for a server-side operation such as a mutation. Server Functions are invoked through network requests, and Server Actions use POST. | Identify the action and operation, then determine which server-side authentication and authorization checks ran. |
| App Router Route Handler | A route.js or route.ts file under the app directory. It uses Web Request and Response APIs and can implement GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. |
Record the handler path, HTTP method, and the identity and permission checks performed in that handler. |
| Pages Router API route | An API route handled by the Pages Router rather than an App Router Route Handler. | Confirm that the Pages Router handled it and locate the corresponding API route and application checks. |
Next.js instrumentation error context can report the router kind and route type. Documented route types include render, route, action, and proxy. Use those clues alongside your route map and deployment records; do not infer that every event labelled as an API request came from the same router implementation.
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Use instrumentation to capture framework error context
Register monitoring during application initialization
Next.js documents instrumentation as the application initialization point for integrating monitoring and logging. Add instrumentation.ts or instrumentation.js at the project root or under src, and export a register function. The official example uses registerOTel('next-app') with @vercel/otel; the integration you choose must suit the deployed runtime and observability setup.
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Forward request errors with their context
The optional onRequestError hook receives an error, read-only request information, and execution context. That context can help distinguish router kind and route type and includes route and request details such as path, method, and headers. If your reporting handler starts asynchronous work, await it as the Next.js documentation instructs.
Do not treat the hook as a complete audit log. It does not define a tenant-aware event format or guarantee that application values such as a validated tenant ID are attached. The error object may also have been processed by React and may not be the original thrown instance; its digest can help identify the error type. Preserve the digest and relevant context, but investigate application logs for the original operation and decision where available.
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Reconstruct the actor, tenant, and authorization decision
For every relevant event, work from server-validated state rather than trusting a tenant value supplied by the browser. Next.js advises treating Server Actions as public-facing endpoints: direct POST requests can invoke Server Functions, so authentication and authorization checks belong in the action itself, not only in the UI. Its Route Handler guidance likewise demonstrates checking for an authenticated session and required role before proceeding.
A practical application-level event should make it possible to answer these questions without exposing unnecessary personal or secret data:
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- Who acted? Record the authenticated actor or a suitably minimized identifier resolved from the server-side session.
- Which tenant context applied? Attach the tenant only after validating it against the authenticated session and your application’s tenant-access rules. Record how the context was selected when that matters to the investigation.
- What authorization decision was made? Capture the relevant permission or policy decision and whether the operation was allowed or denied.
- What operation was attempted? Associate the event with the action or handler and the operation being performed, without logging request contents indiscriminately.
- How does it connect to other events? Use a deliberate request or correlation identifier that your application propagates across its logs and observability provider.
These are application design choices, not fields that Next.js automatically supplies. Define which values are collected, who can access them, how they are redacted, and how long they are retained according to your organization’s privacy and security requirements. The framework documentation does not prescribe a universal tenant schema, correlation format, retention period, or forensic immutability guarantee.
Reconstruct an incident in a reliable order
- Set the incident window in UTC. Start with the reported event time and include enough surrounding time to find related requests, retries, and follow-on actions.
- Pin down the deployment. Associate events with build or deployment identity and server instance where your platform makes those values available. Record the deployed Next.js version and relevant configuration.
- Identify the handler. Establish whether the event came from a Server Action, App Router Route Handler, or Pages Router API route. Compare the concrete action or path with the framework’s recorded route path and type when present.
- Trace the correlation ID. Follow the identifier through application logs and your observability provider. Check whether the linked events describe the same request or operation rather than relying on similar timestamps alone.
- Verify actor and tenant context. Reconstruct the identity from server-validated state, then determine which tenant context was selected and whether the application authorized the operation.
- Compare request and outcome details. Review method, origin, response or error, and the relevant handler or action configuration if rejection or suspicious invocation is alleged.
- Compare instances and builds when failures cluster. If errors began near a rollout or vary by server instance, investigate build differences and the Server Action encryption-key configuration.
If a field was never captured, record that as an uncertainty instead of inferring it from the UI, a client-supplied tenant value, or an error message. Framework error context is useful evidence, but it is not necessarily a complete account of the original exception or the application’s authorization history.
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Check Server Action request protections and configuration
Next.js documents a same-origin comparison between request origin and host domain to help prevent CSRF. Same-origin behavior is the default; allowedOrigins can add trusted origins. The configuration reference also documents a default maximum Server Action request body size of 1MB, which can be configured. These are framework configuration details, not proof that a particular request was safe or unsafe.
Server Actions became stable in Next.js 14 and are enabled by default, but incident analysis should use the actual deployed version and configuration. Local overrides and deployment differences can change how the defaults apply. When investigating a request, compare the observed method and origin with the deployed settings, and verify that the action still performs its own authentication and authorization checks.
Investigate failures that follow a deployment
For self-hosted deployments with multiple servers, Next.js documents a possible Server Action failure when instances use inconsistent encryption keys. The documented mitigation is to configure a shared NEXT_SERVER_ACTIONS_ENCRYPTION_KEY. If errors vary by instance or begin after a release, compare instance configuration, build identity, and the key setup before concluding that a tenant permission defect caused the incident.
For Vercel deployments, Next.js documents Skew Protection as a way to keep prior-version assets and functions available after deployment. That guidance is relevant when the timing of a rollout and the versions serving an interaction may explain failures; it does not establish the cause of any particular incident.
What Next.js logging does not decide for you
Instrumentation gives you an integration point and framework-level request error context. It does not guarantee complete event delivery, attach a validated tenant identifier automatically, or define a universal audit record. Your application and organization must choose how correlation IDs are generated and propagated, how tenant and identity fields are validated and minimized, and how logs are protected, retained, and accessed.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhen selecting an observability integration, evaluate whether it supports your deployed Next.js runtime and instrumentation setup, captures the request and route context you need, allows correlation IDs to be propagated, and provides data access and retention controls that fit your requirements. The Next.js documentation establishes an OpenTelemetry integration example and a custom error-reporting pattern; it does not establish a vendor feature or pricing comparison.
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