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devexamples

Structured JSON Logging Setup

Configure a JSON formatter so every log record carries consistent fields, making logs searchable and correlatable across services.

PythonResilience

Code

snippet
import json
import logging
import sys
from datetime import datetime, timezone


class JsonFormatter(logging.Formatter):
    def format(self, record: logging.LogRecord) -> str:
        payload = {
            "level": record.levelname,
            "message": record.getMessage(),
            "logger": record.name,
            "timestamp": datetime.now(timezone.utc).isoformat(),
        }
        if record.exc_info:
            payload["exception"] = self.formatException(record.exc_info)
        return json.dumps(payload)


def configure_logging(level: str = "INFO") -> logging.Logger:
    logger = logging.getLogger("app")
    handler = logging.StreamHandler(sys.stdout)
    handler.setFormatter(JsonFormatter())
    logger.addHandler(handler)
    logger.setLevel(level)
    return logger

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