An example of the familiar 'chat' websocket demo app, implemented in FastAPI / Starlette.

Run with

uvicorn app:app

And then point your browser to http://localhost:8000. REST API documentation is available under the /docs endpoint.

Data from the server is JSON in the form

{
    "type": ...,
    "data": {
        ...
    }
}

Where type is one of:

• ROOM_JOIN - sent to a user on successfully joining the chatroom
• USER_JOIN - sent to all chatroom users when a new user joins the chatroom
• USER_LEAVE - sent to all chatroom users when a user leaves the chatroom
• ERROR - sent to one or more users in the event of a server error
• MESSAGE - chat message from one user, broadcast to all chatroom users
• WHISPER - private message from one user to another