The fastest Python web framework for building REST APIs
Flask-like syntax • Rust-powered performance • Up to 20,000+ requests/sec

BustAPI is a production-ready Python web framework that combines the best of both worlds: Python's simplicity and Rust's raw performance.

Under the hood, BustAPI runs on Actix-Web — consistently ranked among the fastest web frameworks across all programming languages. But you never touch Rust. You write clean, familiar Python code with Flask-style decorators.

• 🚀 20,000+ RPS out of the box — 5x faster than Flask
• 🦀 Rust-powered — Zero-copy JSON, mimalloc allocator, Actix-Web
• 🐍 Pure Python API — No Rust knowledge required
• 🔒 Security built-in — JWT, sessions, CSRF, rate limiting
• 🛡️ Robust Header System — Case-insensitive, multi-value support, high-performance cookie parsing
• 📦 Zero config — pip install bustapi and you're ready
• 🔥 Hot reload — Rust-native file watcher for instant restarts

from bustapi import BustAPI

app = BustAPI()

@app.route("/")
def hello():
    return {"message": "Hello, world!"}

if __name__ == "__main__":
    app.run()

No ASGI servers needed. No complex configuration. Just run your file.

┌─────────────────────────────────────────────────────────────┐
│                     Your Python Code                        │
│              (Flask-like decorators & handlers)             │
├─────────────────────────────────────────────────────────────┤
│                    PyO3 Bindings (v0.27)                    │
│              (Zero-cost Python ↔ Rust bridge)               │
├─────────────────────────────────────────────────────────────┤
│                  Rust Core (bustapi_core)                   │
│  ┌─────────────┐ ┌─────────────┐ ┌─────────────────────────┐│
│  │ Actix-Web   │ │ serde_json  │ │ mimalloc allocator      ││
│  │ HTTP Server │ │ Zero-copy   │ │ Optimized memory        ││
│  └─────────────┘ └─────────────┘ └─────────────────────────┘│
└─────────────────────────────────────────────────────────────┘

pip install bustapi

Supports: Python 3.10 – 3.14 | Linux, macOS, Windows | x86_64 & ARM64

Pre-built wheels available — no Rust toolchain required!

• Dynamic Routes — /users/<int:id> with automatic type validation
• Blueprints — Modular app organization (Flask-style)
• Turbo Routes — Zero-overhead handlers for maximum speed
• Wildcard Paths — <path:filepath> for catch-all routes

• JWT — Create/validate tokens (HS256, HS384, HS512)
• Sessions — Flask-Login compatible user management
• Password Hashing — Argon2id (OWASP recommended)
• CSRF Protection — Built-in token validation
• Rate Limiting — Rust-powered request throttling

• WebSocket — Full duplex communication + Turbo mode
• Streaming — HTTP Range requests, video seeking
• File Uploads — Multipart form handling
• Static Files — Efficient serving with caching

• Hot Reload — Rust-native file watcher (instant restarts)
• Templates — Built-in Jinja2 via MiniJinja
• CLI Tool — bustapi new, bustapi run, bustapi routes
• Auto-docs — OpenAPI/Swagger generation
• Testing — Built-in TestClient for unit tests

• ASGI/WSGI — Works with Uvicorn, Gunicorn, Hypercorn
• FastAPI-style — Query(), Path(), Body(), Depends()
• Flask-style — request, session, g, current_app

1. Create app.py:

from bustapi import BustAPI, jsonify

app = BustAPI()

@app.route("/")
def home():
    return {"status": "running", "framework": "BustAPI"}

@app.route("/users/<int:user_id>")
def get_user(user_id):
    return jsonify({"id": user_id, "name": "Alice"})

@app.route("/greet", methods=["POST"])
def greet():
    from bustapi import request
    data = request.json
    return {"message": f"Hello, {data.get('name', 'World')}!"}

if __name__ == "__main__":
    app.run(debug=True)  # Hot reload enabled

2. Run it:

python app.py

3. Visit http://127.0.0.1:5000

For maximum performance, use @app.turbo_route(). Path parameters are parsed entirely in Rust:

# Zero-overhead static route
@app.turbo_route("/health")
def health():
    return {"status": "ok"}

# Dynamic route with typed params (parsed in Rust)
@app.turbo_route("/users/<int:id>")
def get_user(id: int):
    return {"id": id, "name": f"User {id}"}

# Cached response (140k+ RPS!)
@app.turbo_route("/config", cache_ttl=60)
def get_config():
    return {"version": "1.0", "env": "production"}

Supported types: int, float, str, path

⚠️ Note: Turbo routes skip middleware, sessions, and request context for speed. Use @app.route() when you need those features.

Linux delivers the best performance with native multiprocessing:

• ~25k RPS standard routes, 100k+ RPS with Turbo + multiprocessing
• Kernel-level load balancing via SO_REUSEPORT
• Automatic worker scaling to CPU cores

python app.py  # Automatically uses multiprocessing

Fully supported for development. Single-process mode (~35k RPS):

pip install bustapi && python app.py

Fully supported for development. Single-process mode (~17k RPS):

pip install bustapi && python app.py

💡 Tip: For production, deploy on Linux servers to unlock multiprocessing performance.

from bustapi import BustAPI
from bustapi.jwt import JWT

app = BustAPI()
jwt = JWT(app, secret_key="your-secret-key")

@app.route("/login", methods=["POST"])
def login():
    # Validate credentials...
    token = jwt.create_access_token(identity=user_id)
    return {"access_token": token}

@app.route("/protected")
@jwt.jwt_required()
def protected():
    return {"user": jwt.get_jwt_identity()}

from bustapi.auth import LoginManager, login_user, current_user, login_required

login_manager = LoginManager(app)

@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)

@app.route("/login", methods=["POST"])
def login():
    user = authenticate(request.form)
    login_user(user)
    return redirect("/dashboard")

@app.route("/dashboard")
@login_required
def dashboard():
    return f"Welcome, {current_user.name}!"

from bustapi.auth import hash_password, verify_password

# Hash (Argon2id)
hashed = hash_password("mysecretpassword")

# Verify
if verify_password("mysecretpassword", hashed):
    print("Password correct!")

@app.websocket("/ws")
async def websocket_handler(ws):
    await ws.accept()
    while True:
        message = await ws.receive_text()
        await ws.send_text(f"Echo: {message}")

Turbo WebSocket (Pure Rust, ~74% faster):

@app.turbo_websocket("/ws/turbo")
def turbo_handler(message: str) -> str:
    return f"Echo: {message}"  # Processed entirely in Rust

from bustapi.testing import TestClient

def test_homepage():
    client = TestClient(app)
    response = client.get("/")
    assert response.status_code == 200
    assert response.json() == {"status": "running"}

def test_create_user():
    response = client.post("/users", json={"name": "Alice"})
    assert response.status_code == 201

bustapi/
├── src/                    # Rust core
│   ├── lib.rs              # PyO3 module entry
│   ├── bindings/           # Python ↔ Rust bridge
│   ├── router/             # URL matching engine
│   ├── server/             # Actix-Web handlers
│   ├── websocket/          # WS session management
│   ├── jwt.rs              # Token encoding/decoding
│   └── crypto.rs           # Argon2, CSRF, tokens
│
├── python/bustapi/         # Python package
│   ├── app.py              # BustAPI main class
│   ├── auth/               # JWT, sessions, CSRF
│   ├── routing/            # Blueprints, decorators
│   ├── params.py           # Query/Path/Body validators
│   └── websocket.py        # WebSocket API
│
├── examples/               # 30+ usage examples
├── tests/                  # Comprehensive test suite
├── docs/                   # MkDocs documentation
└── benchmarks/             # Performance tools

# Create new project
bustapi new myproject

# Run with hot reload
bustapi run

# List all routes
bustapi routes

# Show system info
bustapi info

python app.py

Uses the internal Rust HTTP server. Best performance, zero dependencies.

pip install uvicorn
uvicorn app:app.asgi_app --host 0.0.0.0 --port 8000

FROM python:3.12-slim
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
EXPOSE 5000
CMD ["python", "app.py"]

📚 Full Documentation

• Getting Started
• Routing Guide
• JWT Authentication
• WebSocket Guide
• API Reference

We welcome contributions! Here's how:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing)
5. Open a Pull Request

Found a bug? Have a feature request?

• Open an Issue
• Start a Discussion

If BustAPI helps your project, consider supporting its development:

Binance ID: 1010167458

MIT © 2025-2026 GrandpaEJ

Built with 🦀 Rust + 🐍 Python
Fast. Simple. Production-ready.