structured-logging
Add structured JSON logging to code following project standards. Includes correct log levels, required fields, and what never to log.
Works with
---
name: structured-logging
description: Add structured JSON logging to code following project standards. Includes correct log levels, required fields, and what never to log.
license: MIT
---
## What I do
Produce structured JSON log statements with the correct fields and log level for the situation.
Required fields in every log entry:
- `timestamp` — ISO 8601 with timezone
- `level` — `debug` | `info` | `warn` | `error` | `fatal`
- `message` — Human-readable description
- `service` — Service or application name
## When to use me
Use this skill when adding logging to new code or reviewing existing log statements for compliance.
## Log level guide
| Level | Use case |
|-------|----------|
| `debug` | Dev details, variable dumps, function entry/exit |
| `info` | Normal operations, state changes, successful outcomes |
| `warn` | Recoverable issues, deprecations, retries |
| `error` | Failures requiring attention, unhandled exceptions |
| `fatal` | Critical failures causing process termination |
## Never log
- Passwords, tokens, API keys, or any secrets
- Full PII (email, SSN, credit card numbers)
- Full request/response bodies (may contain secrets or be too large)
- String-concatenated messages — use structured context fields instead
## Example
```json
{
"timestamp": "2024-01-15T09:23:45Z",
"level": "info",
"message": "Payment processed",
"service": "payment-service",
"context": {
"transaction_id": "tx_123",
"amount_cents": 4999,
"currency": "USD",
"duration_ms": 1200
}
}
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