FastAPI Logging (beans-logging-fastapi)

This is a HTTP access log module for FastAPI based on 'beans-logging' package.

✨ Features

• Logger based on 'beans-logging' package
• FastAPI HTTP access logging middleware
• HTTP access log as structured JSON format
• Predefined configuration for HTTP access logs
• Easy to install and use

🛠 Installation

1. 🚧 Prerequisites

• Install Python (>= v3.10) and pip (>= 23):
  • [RECOMMENDED] Miniconda (v3)
  • [arm64/aarch64] Miniforge (v3)
  • [Python virtual environment] venv

[OPTIONAL] For DEVELOPMENT environment:

• Install git
• Setup an SSH key

2. 📦 Install the package

[NOTE] Choose one of the following methods to install the package [A ~ F]:

OPTION A. [RECOMMENDED] Install from PyPi:

pip install -U beans-logging-fastapi

OPTION B. Install latest version directly from GitHub repository:

pip install git+https://github.com/bybatkhuu/module-fastapi-logging.git

OPTION C. Install from the downloaded source code:

git clone https://github.com/bybatkhuu/module-fastapi-logging.git && \
    cd ./module-fastapi-logging

# Install directly from the source code:
pip install .

# Or install with editable mode:
pip install -e .

OPTION D. Install for DEVELOPMENT environment:

pip install -e .[dev]

# Install pre-commit hooks:
pre-commit install

OPTION E. Install from pre-built release files:

1. Download .whl or .tar.gz file from releases
2. Install with pip:

# Install from .whl file:
pip install ./beans_logging_fastapi-[VERSION]-py3-none-any.whl

# Or install from .tar.gz file:
pip install ./beans_logging_fastapi-[VERSION].tar.gz

OPTION F. Copy the module into the project directory (for testing):

# Install python dependencies:
pip install -r ./requirements.txt

# Copy the module source code into the project:
cp -r ./src/beans_logging_fastapi [PROJECT_DIR]
# For example:
cp -r ./src/beans_logging_fastapi /some/path/project/

🚸 Usage/Examples

To use beans_logging_fastapi:

FastAPI

configs/logger.yml:

logger:
  app_name: "fastapi-app"
  level:
    base: TRACE
  http:
    has_proxy_headers: false
    has_cf_headers: false
  intercept:
    mute_modules: ["uvicorn.access"]
  handlers:
    std_handler:
      enabled: true
    http_access_std_handler:
      enabled: true
    http_access_file_handler:
      enabled: true
      sink: "http/{app_name}.http-access.log"
    http_err_file_handler:
      enabled: true
      sink: "http/{app_name}.http-err.log"
    http_access_json_handler:
      enabled: true
      sink: "http.json/{app_name}.http-access.json.log"
    http_err_json_handler:
      enabled: true
      sink: "http.json/{app_name}.http-err.json.log"

.env:

ENV=development
DEBUG=true

config.py:

import os

from pydantic_settings import BaseSettings

from potato_util import io as io_utils
from beans_logging_fastapi import LoggerConfigPM


_config_data = {}
_configs_dir = os.path.join(os.getcwd(), "configs")
if os.path.isdir(_configs_dir):
    _config_data = io_utils.read_all_configs(configs_dir=_configs_dir)


class MainConfig(BaseSettings):
    logger: LoggerConfigPM = LoggerConfigPM()


config = MainConfig(**_config_data)


__all__ = [
    "MainConfig",
    "config",
]

logger.py:

from beans_logging_fastapi import logger

__all__ = [
    "logger",
]

router.py:

from pydantic import validate_call
from fastapi import FastAPI, APIRouter, HTTPException, Request
from fastapi.responses import RedirectResponse

router = APIRouter()


@router.get("/")
def root(request: Request):
    _logger = request.state.logger
    _logger.info("Root endpoint accessed.")

    return {"Hello": "World"}


@router.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):
    return {"item_id": item_id, "q": q}


@router.get("/continue", status_code=100)
def get_continue():
    return {}


@router.get("/redirect")
def redirect():
    return RedirectResponse("/")


@router.get("/error")
def error():
    raise HTTPException(status_code=500)


@validate_call(config={"arbitrary_types_allowed": True})
def add_routers(app: FastAPI) -> None:
    """Add routers to FastAPI app.

    Args:
        app (FastAPI): FastAPI app instance.
    """

    app.include_router(router)

    return


__all__ = ["add_routers"]

bootstrap.py:

# Standard libraries
from typing import Any
from collections.abc import Callable

# Third-party libraries
import uvicorn
from uvicorn._types import ASGIApplication
from pydantic import validate_call
from fastapi import FastAPI

from beans_logging_fastapi import add_logger

# Internal modules
from __version__ import __version__
from config import config
from lifespan import lifespan
from router import add_routers


def create_app() -> FastAPI:
    """Create FastAPI application instance.

    Returns:
        FastAPI: FastAPI application instance.
    """

    app = FastAPI(lifespan=lifespan, version=__version__)

    # Add logger before any other components:
    add_logger(app=app, config=config.logger)

    # Add any other components after logger:
    add_routers(app=app)

    return app


@validate_call(config={"arbitrary_types_allowed": True})
def run_server(
    app: FastAPI | ASGIApplication | Callable[..., Any] | str = "main:app",
) -> None:
    """Run uvicorn server.

    Args:
        app (Union[ASGIApplication, str], optional): ASGI application instance or module path.
    """

    uvicorn.run(
        app=app,
        host="0.0.0.0",  # nosec B104
        port=8000,
        access_log=False,  # Disable default uvicorn access log
        server_header=False,
        proxy_headers=False,
        forwarded_allow_ips="*",
    )

    return


__all__ = [
    "create_app",
    "run_server",
]

main.py:

#!/usr/bin/env python

# Third-party libraries
from dotenv import load_dotenv

load_dotenv(override=True)

# Internal modules
from bootstrap import create_app, run_server  # noqa: E402
from logger import logger  # noqa: E402


app = create_app()


def main() -> None:
    """Main function."""

    run_server(app=app)
    return


if __name__ == "__main__":
    logger.info("Starting server from 'main.py'...")
    main()


__all__ = ["app"]

Run the examples:

cd ./examples
# Install python dependencies for examples:
pip install -r ./requirements.txt

uvicorn main:app --host=0.0.0.0 --port=8000

Output:

[2026-06-05 00:55:29.335 +09:00 | TRACE | - | beans_logging.intercepters:96]: Intercepted modules: ['potato_util', 'dotenv.main', 'concurrent', 'potato_util.io', 'asyncio', 'fastapi', 'concurrent.futures', 'dotenv', 'uvicorn', 'watchfiles.watcher', 'potato_util.io._sync', 'watchfiles.main', 'potato_util._base', 'uvicorn.error', 'watchfiles']; Muted modules: ['uvicorn.access'];
[2026-06-05 00:55:29.336 +09:00 | INFO  | - | uvicorn.server:84]: Started server process [95017]
[2026-06-05 00:55:29.336 +09:00 | INFO  | - | uvicorn.lifespan.on:48]: Waiting for application startup.
[2026-06-05 00:55:29.337 +09:00 | TRACE | - | lifespan:19]: TRACE diagnosis is ON!
[2026-06-05 00:55:29.337 +09:00 | DEBUG | - | lifespan:20]: DEBUG mode is ON!
[2026-06-05 00:55:29.337 +09:00 | INFO  | - | lifespan:21]: Preparing to startup...
[2026-06-05 00:55:29.337 +09:00 | OK    | - | lifespan:24]: Finished preparation to startup.
[2026-06-05 00:55:29.337 +09:00 | INFO  | - | lifespan:25]: Version: 0.0.0
[2026-06-05 00:55:29.337 +09:00 | INFO  | - | uvicorn.lifespan.on:62]: Application startup complete.
[2026-06-05 00:55:29.339 +09:00 | INFO  | - | uvicorn.server:216]: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
[2026-06-05 00:55:33.367 +09:00 | DEBUG | 58c916d045844314bb6c10b390ad5593]: 127.0.0.1 - "GET / HTTP/1.1"
[2026-06-05 00:55:33.370 +09:00 | INFO  | 58c916d045844314bb6c10b390ad5593 | router:11]: Root endpoint accessed.
[2026-06-05 00:55:33.371 +09:00 | OK    | 58c916d045844314bb6c10b390ad5593]: 127.0.0.1 - "GET / HTTP/1.1" 200 17B 3.0ms
^C[2026-06-05 00:55:35.702 +09:00 | INFO  | - | uvicorn.server:264]: Shutting down
[2026-06-05 00:55:35.805 +09:00 | INFO  | - | uvicorn.lifespan.on:67]: Waiting for application shutdown.
[2026-06-05 00:55:35.805 +09:00 | INFO  | - | lifespan:29]: Preparing to shutdown...
[2026-06-05 00:55:35.805 +09:00 | OK    | - | lifespan:31]: Finished preparation to shutdown.
[2026-06-05 00:55:35.805 +09:00 | INFO  | - | uvicorn.lifespan.on:76]: Application shutdown complete.
[2026-06-05 00:55:35.806 +09:00 | INFO  | - | uvicorn.server:94]: Finished server process [95017]

👍

⚙️ Configuration

templates/configs/config.yml:

logger:
  # app_name: fastapi-app
  level:
    base: INFO
    err: WARNING
  default_format: "[{time:YYYY-MM-DD HH:mm:ss.SSS Z} | {extra[level_short]:<5} | {name}:{line} {extra[request_id]}]: {message}"
  file:
    logs_dir: "./logs"
    rotate_size: 10000000
    rotate_time: "00:00:00"
    retention: 90
    encoding: utf8
  custom_serialize: false
  http:
    std:
      sub_format: '{client_host} {user_id} "<u>{method} {url_path}</u> HTTP/{http_version}" {status_code} {content_length}B {response_time}ms'
      err_sub_format: '{client_host} {user_id} "<u>{method} {url_path}</u> HTTP/{http_version}" <n>{status_code}</n>'
      debug_sub_format: '{client_host} {user_id} "<u>{method} {url_path}</u> HTTP/{http_version}"'
    file:
      format_: '{client_host} {request_id} {user_id} [{datetime}] "{method} {url_path} HTTP/{http_version}" {status_code} {content_length} "{h_referer}" "{h_user_agent}" {response_time}'
      tz: localtime
    has_proxy_headers: true
    has_cf_headers: true
  intercept:
    enabled: true
    only_base: false
    ignore_modules: []
    include_modules: []
    mute_modules: [uvicorn.access]
  global_extra:
    trace_id: ""
    request_id: ""
    user_id: ""
  handlers:
    std_handler:
      enabled: true
      type_: STD
      format: "[<c>{time:YYYY-MM-DD HH:mm:ss.SSS Z}</c> | <level>{extra[level_short]:<5}</level> | <w>{name}:{line}</w> <d><w>{extra[request_id]}</w></d>]: <level>{message}</level>"
      colorize: true
    file_handler:
      enabled: true
      type_: FILE
      sink: "{app_name}.all.log"
    err_file_handler:
      enabled: true
      type_: FILE
      sink: "{app_name}.err.log"
      error: true
    json_handler:
      enabled: true
      type_: FILE
      sink: "json/{app_name}.all.json.log"
      serialize: true
    err_json_handler:
      enabled: true
      type_: FILE
      sink: "json/{app_name}.err.json.log"
      serialize: true
      error: true
    http_access_std_handler:
      enabled: true
      type_: STD
      format: "[<c>{time:YYYY-MM-DD HH:mm:ss.SSS Z}</c> | <level>{extra[level_short]:<5}</level> | <d><w>{extra[request_id]}</w></d>]: <level>{message}</level>"
      colorize: true
    http_access_file_handler:
      enabled: true
      type_: FILE
      sink: "http/{app_name}.http-access.log"
    http_err_file_handler:
      enabled: true
      type_: FILE
      sink: "http/{app_name}.http-err.log"
      error: true
    http_access_json_handler:
      enabled: true
      type_: FILE
      sink: "http.json/{app_name}.http-access.json.log"
    http_err_json_handler:
      enabled: true
      type_: FILE
      sink: "http.json/{app_name}.http-err.json.log"
      error: true
  extra:

🌎 Environment Variables

.env.example:

# ENV=LOCAL
# DEBUG=false
# TZ=UTC

🧪 Running Tests

To run tests, run the following command:

# Install python test dependencies:
pip install .[test]

# Run tests:
python -m pytest -sv -o log_cli=true
# Or use the test script:
./scripts/test.sh -l -v -c

🏗️ Build Package

To build the python package, run the following command:

# Install python build dependencies:
pip install -r ./requirements/requirements.build.txt

# Build python package:
python -m build
# Or use the build script:
./scripts/build.sh

📝 Generate Docs

To build the documentation, run the following command:

# Install python documentation dependencies:
pip install -r ./requirements/requirements.docs.txt

# Serve documentation locally (for development):
mkdocs serve -a 0.0.0.0:8000 --livereload
# Or use the docs script:
./scripts/docs.sh

# Or build documentation:
mkdocs build
# Or use the docs script:
./scripts/docs.sh -b

📚 Documentation

• Docs

📑 References

• https://packaging.python.org/en/latest/tutorials/packaging-projects
• https://python-packaging.readthedocs.io/en/latest