```python
from fastapi import FastAPI, Request, status
from fastapi.responses import JSONResponse

import helpers  # noqa: F401

app = FastAPI()


@app.post("/documents")
async def save_document_endpoint(request: Request):
    body = await request.json()
    name = body.get("name")
    text = body.get("text")
    # Optionally, reject invalid input, but requirements do not specify.
    bytes_written = helpers.save_document(name, text)
    return JSONResponse(content={"bytes": bytes_written}, status_code=status.HTTP_201_CREATED)
```