In the Next.js app, ensure Sentry telemetry is privacy-preserving. Add a beforeSend hook to scrub PII from events and disable PII collection by default. Specifically: (1) remove or redact event.user.name, event.user.email, event.user.username, and any other PII fields; (2) remove sensitive data from event.request (headers cookies, authorization; and any sensitive header fields); (3) sanitize event.request.url by removing query parameters that may contain user data; (4) set sendDefaultPii: false; (5) consider limiting captured data to non-identifying metrics and enable a user consent toggle for telemetry. Example code (pseudo): import * as Sentry from '@sentry/nextjs'; Sentry.init({ dsn: process.env.SENTRY_DSN, beforeSend(event){ if(event.user){ delete event.user.email; delete event.user.name; delete event.user.username; event.user = {}; } if(event.request && event.request.headers){ delete event.request.headers.cookie; delete event.request.headers.authorization; } if(event.request && event.request.url){ event.request.url = event.request.url.split('?')[0]; } return event; }, sendDefaultPii: false });

Actionable fix: 1) Do not expose Sentry keys in client-side request URLs. Replace direct client ingestion with a server-side proxy or ensure the DSN is loaded from environment variables without logging the full ingest URL. 2) If using a client DSN, verify that logs and analytics do not capture the full URL including the sentry_key and sentry_version. 3) Rotate the Sentry keys if leakage is suspected and restrict events to a secure domain. 4) Validate your Sentry SDK configuration to ensure events are sent through a secure channel without leaking credentials in query strings.

Actionable prompt for a coding assistant: 'In the frontend/client code, replace direct client-side POST to the Sentry ingestion URL with a backend proxy. Remove any hard-coded SENTRY_KEY from client requests and load the DSN from a server-only environment variable (e.g., NEXT_PUBLIC_SENTRY_DSN should be removed from client code). Implement a backend endpoint (e.g., /api/report-error) that receives error payloads from the client and forwards them to Sentry using a server-side, restricted DSN. Add CORS that only allows requests from the trusted origin. Implement a beforeSend filter to scrub PII and limit data, and enable rate limiting on the proxy to prevent abuse. Rotate DSN/keys after deployment and add Content Security Policy and logging to detect misuse.'