Log levels are used appropriately

CWE-779 (Logging of Excessive Data) and CWE-778 (Insufficient Logging) sit at opposite ends of the same failure: logging everything at one level either floods your log store with noise or misses the signal entirely. OWASP A09 and NIST AU-2 both require that logged events carry enough severity context to support triage. When error level is used for informational messages or info is used for caught exceptions, alerting rules misfires — high-severity issues never trigger a page, and on-call engineers chase false alarms. The business impact is delayed incident response: teams lose the ability to distinguish a 500-rate spike from routine debug output.

Audit your catch blocks and log call sites and apply consistent level semantics: error for failures that require attention, warn for recoverable anomalies, info for significant business events, debug for diagnostic detail.

try {
  await processPayment(userId)
  logger.info({ userId, event: 'payment.success' }, 'Payment processed')
} catch (err) {
  logger.error({ err, userId }, 'Payment processing failed') // error — not info
}

Search for logger.info inside catch blocks across app/api/ and lib/ — those are the most common miscategorizations. Set up a Sentry alert rule on error-level log volume so you notice when the rate changes.

• ID: saas-logging.app-logging.log-levels-appropriate

• Severity: medium

• What to look for: Enumerate all relevant files and Examine server-side code for log level usage. Check whether error level is used for actual errors (caught exceptions, failed operations), warn for recoverable problems and unexpected states, info for notable business events (user signed up, subscription created), and debug for detailed diagnostic data. Look for misuse: using error for informational messages, using info for everything, or using a single level throughout. Quote the exact code pattern or configuration value found.

• Pass criteria: At least 1 implementation must be present. At least two distinct log levels are in use in server-side code, used in semantically appropriate contexts. Errors and exceptions are logged at error level. Routine operational messages use info or lower. Debug-level logging exists and is separate from error-level.

• Fail criteria: Only one log level is used throughout (usually console.log or logger.info for everything), OR errors and normal messages are logged at the same level, OR the logging library is present but level differentiation is absent. A partial or incomplete implementation does not count as pass.

• Skip (N/A) when: No server-side logging of any kind is present (see structured-logging — if that check is skipped, this one is too).

• Cross-reference: For performance impact of logging on application throughput, the Performance & Load audit covers I/O bottlenecks and async patterns.

• Detail on fail: Describe the issue specifically. Example: "All logging uses logger.info including exception catch blocks; error-level logging not used anywhere in server code" or "console.log used for everything — no level differentiation"

• Remediation: Log levels let you filter noise in production and alert on real problems. The convention is: error for things that need immediate attention, warn for things that are wrong but recoverable, info for significant business events, debug for diagnostic detail you only need when investigating.

  Update your error handlers to use the right level:

  try {
    await processPayment(userId)
    logger.info({ userId, event: 'payment.success' }, 'Payment processed')
  } catch (err) {
    logger.error({ userId, err }, 'Payment processing failed') // error level for failures
  }