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typescript.missing_structured_logging

Observability Medium

Detects unstructured string logging instead of structured logs with fields.

Why It Matters

Unstructured logs:

Hard to query — Can’t filter by field values
No aggregation — Can’t count by error type
Poor metrics — Harder to build dashboards

Example

// ❌ Before (unstructured logging)
console.log(`User ${userId} logged in from ${ip}`);
console.error(`Failed to process order ${orderId}: ${error}`);

// ✅ After (structured logging)
import pino from 'pino';
const logger = pino();

logger.info({ userId, ip }, 'User logged in');
logger.error({ orderId, err: error }, 'Failed to process order');

What Unfault Detects

Template literals in console.log
Missing structured logger usage
Debug prints with interpolated values

Auto-Fix

Unfault can convert to structured logging with pino or winston.