fastapi-ndjson-logger 0.1.4

A FastAPI middleware for logging requests and responses in NDJSON format

FastAPI-Logger

FastAPI-Logger is a middleware that provides easy-to-use request and response logging for FastAPI applications. It supports log rotation, custom log directory, and handles sensitive data securely by redacting sensitive headers.

---

Features

• Logs all incoming requests and outgoing responses.
• Supports log rotation with customizable file size and backup count.
• Handles sensitive data by redacting headers like Authorization.
• Outputs logs in JSON format for easy integration with log management tools.
• Flexible configuration for log directory and file size.

---

Requirements

• Python 3.12 or higher
• FastAPI framework

Installation

Create and activate a virtual environment and then install FastAPI & fastapi_ndjson_logger:

pip install "fastapi[standard]" fastapi_ndjson_logger

Example

Create a new FastAPI app and add the middleware to it:

import os

from fastapi import FastAPI
from fastapi_ndjson_logger import RequestResponseLogging

# Create logs directory if it doesn't exist
os.makedirs("logs/request_response_logs", exist_ok=True)

app = FastAPI()
app.add_middleware(
    RequestResponseLogging,
    og_dir=os.path.join("logs", "request_response_logs"),  # Directory for log files
    max_mbytes=8,  # 8 MB max file size
    backup_count=3,  # Keep up to 3 rotated files
)

# Add routes to the app
@app.get("/")
async def read_root():
    return {"Hello": "World"}

Run it

uvicorn app.main:app --reload

Check the logs

cat logs/request_response_logs/app_log.ndjson

Configuration Parameters

Parameter	Description	Default Value
log_dir	Directory to store log files	app_logs
max_mbytes	Maximum size of a log file in Mega bytes before rotation	8 (8 MB)
backup_count	Number of rotated files to retain	5

Support

For any questions or issues, feel free to open an issue on the GitHub repository.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Contributing

Contributions are welcome! Please see the CONTRIBUTING.md for guidelines on how to submit improvements and bug fixes. Also, please see the CODE_OF_CONDUCT.md.

Author

Rajath Kumar K S