fastrapi 0.1.3

A high-performance Python API framework powered by Rust

FastrAPI ⚡

A blazing-fast web framework that brings Rust performance to Python developers. FastrAPI + Rust = FastrAPI.

✨ Key Features

• 🚀 Blazing Performance: Powered by Rust and Axum - up to 88x faster than FastAPI
• 🐍 Python-First: Write familiar Python code with zero Rust knowledge required
• 🛡️ Rock-Solid Types: Built-in type safety inherited from Rust's robust type system
• ⚡ Async Native: Tokio-powered async runtime for maximum concurrency
• 🪶 Ultra Lightweight: Minimal runtime overhead with maximum throughput
• 🎯 Drop-in Replacement: Compatible with FastAPI's beloved decorator syntax

Installation

uv

uv install fastrapi

pip

pip install fastrapi

Quick Start

from fastrapi import FastrAPI
app = FastrAPI()

@app.get("/hello")
def hello():
    return {"Hello": "World"}

@app.post("/echo")
def echo(data):
    return {"received": data}
if __name__ == "__main__":
    app.serve("127.0.0.1", 8080)

Now, test it with:

    curl http://127.0.0.1:8080/hello

For the POST endpoint:

curl --location 'http://127.0.0.1:8080/echo' \
--header 'Content-Type: application/json' \
--data '{"foo": 123, "bar": [1, 2, 3]}'

Performance

Benchmarks using k6 show it outperforms FastAPI + Guvicorn across multiple worker configurations.

🖥️ Test Environment

• Kernel: 6.16.8-arch3-1
• CPU: AMD Ryzen 7 7735HS (16 cores, 4.83 GHz)
• Memory: 15 GB
• Load Test: 20 Virtual Users (VUs), 30s

⚡ Benchmark Results

Framework	Avg Latency (ms)	Median Latency (ms)	Requests/sec	Speed Metric (req/sec ÷ avg ms)
FASTRAPI	2.19	2.16	8881	4051
FastAPI + Uvicorn (workers: 1)	21.08	19.67	937	44
FastAPI + Uvicorn (workers: 16)	4.84	4.17	3882	802

TLDR; FASTRAPI handles thousands of requests per second with ultra-low latency — making it ~91× faster than FastAPI + Guvicorn with 1 worker.

Current Limitations

• Limited validation features compared to FastAPI's Pydantic integration
• Some advanced features are still in development

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

• Fork the repository
• Create your feature branch (git checkout -b feature/amazing-feature)
• Commit your changes (git commit -m 'Add some amazing feature')
• Push to the branch (git push origin feature/amazing-feature)
• Open a Pull Request

License

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

Acknowledgments

Inspired by FastAPI Built with PyO3 and Axum