Logging

Logs are written to both stdout and daily JSON log files.

Log Files

Logs are stored in the logs directory with daily rotation:

logs/
├── 25-12-2025.json
├── 26-12-2025.json
└── ...

Log file format: dd-mm-yyyy.json

Log Structure

Each line in the log file is a JSON object containing:

{
  "level": 30,
  "time": 1735123456789,
  "service": "chromium-pdf-service",
  "requestedKey": "invoice-123",
  "msg": "Job completed"
}

Log Levels

Level	Name	Description
10	trace	Very detailed debugging
20	debug	Debugging information
30	info	General information
40	warn	Warning messages
50	error	Error messages
60	fatal	Fatal errors

Configuration

Set log level via environment variable:

LOG_LEVEL=debug npm start

Or in Docker:

environment:
  - LOG_LEVEL=info