Most developers underestimate what their logs reveal.
In 2025, with centralized observability and distributed systems everywhere, a single stray Log.d() or console.log() can leak sensitive data — tokens, PII, internal IDs — straight into your dashboards.
💥 Common mistakes still happening
- Logging full API responses or request bodies
- Leaving debug logs in release builds
- Forgetting to sanitize user data or identifiers
🔐 What you should be doing
✅ Use structured JSON logs
✅ Mask or hash sensitive fields
✅ Strip debug logs with R8/ProGuard
✅ Automate CI/CD checks for unsafe keywords
✅ Store logs securely with encryption & retention policies
🧠 Bonus: Code examples
- Android (Kotlin + Timber structured logs)
- Node.js (Express middleware sanitizing body + requestId tracking)
Secure logging is not optional anymore — it’s part of responsible engineering.
Every log should help you debug, not expose your users.
👉 Read the full detailed article (with complete Kotlin & Node.js code) here:
https://medium.com/@vaibhav.shakya786/your-logs-are-leaking-secrets-and-you-dont-even-know-it-yet-1a71543d4081
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