issue_comments: 762488336

I encountered your issue when trying to find a solution and came up with the following, maybe it can help.

```python import logging.config from typing import Tuple

import structlog import uvicorn

from example.config import settings

shared_processors: Tuple[structlog.types.Processor, ...] = ( structlog.contextvars.merge_contextvars, structlog.stdlib.add_logger_name, structlog.stdlib.add_log_level, structlog.processors.TimeStamper(fmt="iso"), )

logging_config = { "version": 1, "disable_existing_loggers": False, "formatters": { "json": { "()": structlog.stdlib.ProcessorFormatter, "processor": structlog.processors.JSONRenderer(), "foreign_pre_chain": shared_processors, }, "console": { "()": structlog.stdlib.ProcessorFormatter, "processor": structlog.dev.ConsoleRenderer(), "foreign_pre_chain": shared_processors, }, **uvicorn.config.LOGGING_CONFIG["formatters"], }, "handlers": { "default": { "level": "DEBUG", "class": "logging.StreamHandler", "formatter": "json" if not settings.debug else "console", }, "uvicorn.access": { "level": "INFO", "class": "logging.StreamHandler", "formatter": "access", }, "uvicorn.default": { "level": "INFO", "class": "logging.StreamHandler", "formatter": "default", }, }, "loggers": { "": {"handlers": ["default"], "level": "INFO"}, "uvicorn.error": { "handlers": ["default" if not settings.debug else "uvicorn.default"], "level": "INFO", "propagate": False, }, "uvicorn.access": { "handlers": ["default" if not settings.debug else "uvicorn.access"], "level": "INFO", "propagate": False, }, }, }

def setup_logging() -> None: structlog.configure( processors=[ structlog.stdlib.filter_by_level, *shared_processors, structlog.stdlib.PositionalArgumentsFormatter(), structlog.processors.StackInfoRenderer(), structlog.processors.format_exc_info, structlog.stdlib.ProcessorFormatter.wrap_for_formatter, ], context_class=dict, logger_factory=structlog.stdlib.LoggerFactory(), wrapper_class=structlog.stdlib.AsyncBoundLogger, cache_logger_on_first_use=True, ) logging.config.dictConfig(logging_config) ```

And then it'll be run on the startup event: python @app.on_event("startup") async def startup_event() -> None: setup_logging()

It depends on a setting called debug which controls if it should output the regular uvicorn logging or json.