Flask Adapter

The Flask adapter exposes your pRPC procedures at POST /rpc on a Flask app.

Installation

uv add prpc prpc-flask

Basic Setup

from flask import Flask
from prpc import rpc
from prpc_flask import mount_flask

app = Flask(__name__)

@rpc
def add(a: int, b: int) -> int:
    return a + b

mount_flask(app)

This registers add in the global registry and mounts a POST /rpc endpoint that forwards requests to pRPC.

How It Works

• @rpc registers functions in the default registry.
• mount_flask(app) adds a /rpc route on the Flask app.
• The adapter:
  • parses JSON from the request body
  • calls handle_request(payload)
  • returns a JSON response using jsonify

Because Flask is sync-only, the adapter runs the async interpreter with anyio.run.