Add this audit logging middleware?

Situation

The compliance team requires an audit trail for all API requests. GPT-5.3 generated an Express middleware to capture request metadata.

Environment

The API runs behind a load balancer that sets X-Forwarded-For. Logs are shipped to a SIEM with 1-year retention. Health and metrics endpoints must not generate audit noise. User IDs are pseudonymized in storage.

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pending review

const crypto = require('crypto');
const { createHash } = require('crypto');

app.use((req, res, next) => {
  const requestId = crypto.randomUUID();
  const startTime = Date.now();
  
  res.on('finish', () => {
    const logEntry = {
      requestId,
      method: req.method,
      path: req.path,
      statusCode: res.statusCode,
      durationMs: Date.now() - startTime,
      userAgent: req.headers['user-agent']?.substring(0, 128),
      clientIp: req.ip,
      timestamp: new Date().toISOString()
    };
    
    if (req.user?.id) {
      logEntry.userId = createHash('sha256')
        .update(req.user.id.toString())
        .digest('hex')
        .substring(0, 16);
    }
    
    const skipPaths = ['/health', '/metrics', '/readyz', '/livez'];
    if (!skipPaths.includes(req.path)) {
      auditLogger.info('api_request', logEntry);
    }
  });
  
  res.setHeader('X-Request-ID', requestId);
  next();
});