FastAPI + SyftBox
Project description
fastsyftbox
Build offline-first Python apps with FastAPI and SyftBox — FAST.
🚀 Features
- Build local admin UIs with FastAPI.
- Build delay-tolerant UIs/APIs using SyftEvents.
- Keep private data offline with SyftBox HTTP over RPC.
- Builtin JS SDK with
fetchcompatible syntax - Debug APIs with a built-in Postman-style interface.
🔧 Purpose
How can you build a web app that runs on your own device, without uploading data to the cloud?
With SyftBox, you can:
- Run a webserver anywhere that can go offline and keep functioning when it comes back online.
- Access your data even when offline or when your laptop lid is closed.
⚡ Quick Start
Install with uv and create your app:
uvx fastsyftbox version
uvx fastsyftbox create app test
To start in hot-reloading more:
cd test
./run.sh
This generates a sample FastAPI app in app.py:
app = FastSyftBox(
app_name=app_name,
syftbox_endpoint_tags=[
"syftbox"
], # endpoints with this tag are also available via Syft RPC
include_syft_openapi=True, # Create OpenAPI endpoints for syft-rpc routes
)
# normal fastapi
@app.get("/", response_class=HTMLResponse)
def root():
return HTMLResponse("<html><body><h1>Welcome to {app_name}</h1>")
# build a model with pydantic
class MessageModel(BaseModel):
message: str
name: str | None = None
# make syftbox rpc endpoints easily
# syft://{datasite}/app_data/{app_name}/rpc/hello
@app.post("/hello", tags=["syftbox"])
def hello_handler(request: MessageModel):
print("got request", request)
response = MessageModel(message=f"Hi {request.name}", name="Bob")
return response.model_dump_json()
# Debug your RPC endpoints in the browser
app.enable_debug_tool(
endpoint="/hello",
example_request=str(MessageModel(message="Hello!", name="Alice").model_dump_json()),
publish=True,
)
HTTP / JS
Vanilla JS fetch:
const url = "http://somewebsite.com/api"
const request = await fetch(url, {
method: 'POST',
headers,
body
});
Becomes syftFetch:
const syftUrl = "syft://madhava@openmined.org/app_data/fastsyftbox/rpc/hello"
const request = await syftFetch(syftUrl, {
method: 'POST',
headers,
body
});
Under the hood:
- Translates to the correct HTTP request
- Adds
syft-xheaders - Waits for queued response
- Polls future until completed
What is SyftBox?
🧱 Your Dependencies
Add any Python dependencies to requirements.txt and run.sh will install them fresh every run.
🧪 RPC Debug Tool
Its like Postman but for SyftBox RPC.
A built-in HTML/JS tool helps you debug your HTTP over RPC endpoints. To enable:
app.enable_debug_tool(
endpoint="/hello",
example_request=str(MessageModel(message="Hello!", name="Alice").model_dump_json()),
publish=True,
)
🧭 Construct syft:// RPC URLs
🎯 Configure custom headers
🔍 View real-time responses
Then visit either: http://localhost:${SYFTBOX_ASSIGNED_PORT}/rpc-debug or if you have publish=True https://syftbox.net/datasites/{{ email }}/public/{{ app_name }}/rpc-debug.html
📥 SyftBox App Install via GitHub
syftbox app install GITHUB_URL
This executes run.sh and binds your app to a random port: http://localhost:${SYFTBOX_ASSIGNED_PORT}
📚 Example fastsyftbox Apps
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