Robyn

Robyn is a High-Performance, Community-Driven, and Innovator Friendly Web Framework with a Rust runtime. You can learn more by checking our community resources and following us on LinkedIn!

Source: TechEmpower Round 22

📦 Installation

You can simply use Pip for installation.

pip install robyn

Or, with conda-forge

conda install -c conda-forge robyn

To install with all optional features (Pydantic validation, Jinja2 templating):

pip install "robyn[all]"

🤔 Usage

🚀 Define your API

To define your API, you can add the following code in an app.py file.

from robyn import Robyn

app = Robyn(__file__)

@app.get("/")
async def h(request):
    return "Hello, world!"

app.start(port=8080)

🏃 Run your code

Simply run the app.py file you created. You will then have access to a server on the localhost:8080, that you can request from an other program. Robyn provides several options to customize your web server.

$ python3 app.py

To see the usage

usage: app.py [-h] [--processes PROCESSES] [--workers WORKERS] [--dev] [--log-level LOG_LEVEL]

Robyn, a fast async web framework with a rust runtime.

options:
  -h, --help            show this help message and exit
  --processes PROCESSES
                        Choose the number of processes. [Default: 1]
  --workers WORKERS     Choose the number of workers. [Default: 1]
  --dev                 Development mode. It restarts the server based on file changes.
  --log-level LOG_LEVEL
                        Set the log level name
  --create              Create a new project template.
  --docs                Open the Robyn documentation.
  --open-browser        Open the browser on successful start.
  --version             Show the Robyn version.
  --compile-rust-path COMPILE_RUST_PATH
                        Compile rust files in the given path.
  --create-rust-file CREATE_RUST_FILE
                        Create a rust file with the given name.
  --disable-openapi     Disable the OpenAPI documentation.
  --fast                Enable the fast mode.

Log level can be DEBUG, INFO, WARNING, or ERROR.

When running the app using --open-browser a new browser window will open at the app location, e.g:

$ python3 app.py --open-browser

💻 Add more routes

You can add more routes to your API. Check out the routes in this file as examples.

🐍 Python Version Support

Robyn is compatible with the following Python versions:

Python >= 3.10

It is recommended to use the latest version of Python for the best performances.

Please make sure you have the correct version of Python installed before starting to use this project. You can check your Python version by running the following command in your terminal:

python --version

💡 Features

• Under active development!
• A multithreaded Runtime
• Extensible
• A simple API
• Sync and Async Function Support
• Dynamic URL Routing
• Multi Core Scaling
• WebSockets
• Middlewares (before and after request hooks)
• Built in form data handling
• Dependency Injection
• Hot Reloading
• Direct Rust Integration
• Automatic OpenAPI generation
• Jinja2 Templating
• Static File Serving
• File Responses and Downloads
• Authentication Support
• CORS Configuration
• Streaming / SSE Responses
• Startup and Shutdown Events
• Exception Handling
• SubRouters
• Project Scaffolding via CLI
• Experimental io-uring Support
• 🤖 AI Agent Support - Built-in agent routing and execution
• 🔌 MCP (Model Context Protocol) - Connect to AI applications as a server
• Community First and truly FOSS!

🗒️ How to contribute

🏁 Get started

Please read the code of conduct and go through CONTRIBUTING.md before contributing to Robyn. Feel free to open an issue for any clarifications or suggestions.

If you're feeling curious. You can take a look at a more detailed architecture here.

If you still need help to get started, feel free to reach out on our community discord.

⚙️ To Develop Locally

Prerequisites

Before starting, ensure you have the following installed:

• Python >= 3.10, <= 3.14
• Rust (latest stable)
• C compiler (gcc/clang)

Setup

• Clone the repository:

  git clone https://github.com/sparckles/Robyn.git
  

• Setup a virtual environment:

  python3 -m venv .venv
  source .venv/bin/activate
  

• Install required packages

  pip install pre-commit poetry maturin
  

• Install development dependencies

  poetry install --with dev --with test
  

• Install pre-commit git hooks

  pre-commit install
  

• Build & install Robyn Rust package

  maturin develop
  

• Build & install Robyn Rust package (experimental)

  maturin develop --cargo-extra-args="--features=io-uring"
  

• Run!

  poetry run test_server
  

• Run all tests

  pytest
  

• Run only the integration tests

  pytest integration_tests
  

• Run only the unit tests (you don't need to be running the test_server for these)

  pytest unit_tests
  

• Test (refer to integration_tests/base_routes.py for more endpoints)

  curl http://localhost:8080/sync/str
  

• tip: One liners for testing changes!

  maturin develop && poetry run test_server
  
  maturin develop && pytest 
  

• tip: For IO-uring support, you can use the following command:

  maturin develop --cargo-extra-args="--features=io-uring"
  

• tip: To use your local Robyn version in other projects, you can install it using pip:

  pip install -e path/to/robyn/target/wheels/robyn-<version>-<python_version>-<platform>.whl
  

e.g.

pip install -e /repos/Robyn/target/wheels/robyn-0.63.0-cp312-cp312-macosx_10_15_universal2.whl

Troubleshooting

If you face any issues, here are some common fixes:

• install patchelf with pip install patchelf if you face patchelf not found issue during maturin develop (esp. on Arch Linux)
• If you get Rust compilation errors, ensure you have a C compiler installed:
  • Ubuntu/Debian: sudo apt install build-essential
  • Fedora: sudo dnf install gcc
  • macOS: Install Xcode Command Line Tools
  • Windows: Install Visual Studio Build Tools

✨ Special thanks

✨ Contributors/Supporters

Thanks to all the contributors of the project. Robyn will not be what it is without all your support :heart:.

Special thanks to the PyO3 community and Andrew from PyO3-asyncio for their amazing libraries and their support for my queries. 💖

✨ Sponsors

These sponsors help us make the magic happen!

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