react-socket

A TypeScript-first WebSocket manager for React that handles the socket plumbing you don't want to build.

Documentation  ·  NPM  ·  GitHub

Install

npm install @luciodale/react-socket

Quick Start

The minimum to get a typed WebSocket connection with automatic reconnection.

// app.tsx
import { WebSocketManager, useConnectionState } from "@luciodale/react-socket"

type ClientMsg = { type: "echo"; text: string }
type ServerMsg = { type: "echo_reply"; text: string }

const manager = new WebSocketManager<ClientMsg, ServerMsg>({
  url: "wss://your-server.com/ws",
  serialize: (msg) => JSON.stringify(msg),
  deserialize: (raw) => JSON.parse(raw),
  onMessageReceived: (msg) => {
    console.log("received:", msg)
  },
})

manager.connect()

function App() {
  const state = useConnectionState(manager)

  return (
    <div>
      <p>Connection: {state}</p>
      <button
        onClick={() =>
          manager.send({ data: { type: "echo", text: "hello" } })
        }
      >
        Send
      </button>
    </div>
  )
}

Change a field in ClientMsg or ServerMsg and TypeScript tells you every place that needs updating. The generic types flow through serialize, deserialize, onMessageReceived, and send with zero casts.

Features

• Automatic reconnection — exponential backoff with jitter, configurable max attempts and delays. Subscriptions restore themselves on reconnect without extra code.
• Ref-counted subscriptions — multiple components can subscribe to the same channel. The manager tracks reference counts internally and only sends the subscribe/unsubscribe message when the first component mounts or the last one unmounts.
• In-flight tracking — tag outgoing messages with an ackId. The manager holds them until the server acknowledges or the connection drops, then notifies you of unacknowledged messages so nothing gets silently lost.
• Keep-alive (ping/pong) — configurable ping interval and pong timeout. If the server goes silent, the manager detects it and triggers reconnection before your users notice.
• Undelivered sync — optional persistent storage for messages that failed to send. Survives page reloads via localStorage (or any custom IStorage implementation).
• Pluggable transport — the default uses the browser WebSocket API, but you can swap in any transport that implements IWebSocketTransport. Useful for testing or non-browser environments.
• Full TypeScript generics — WebSocketManager<TClientMsg, TServerMsg> propagates your message types across the entire API surface. Discriminated unions, generics, compile-time safety.
• DevTools inspector — a drop-in InspectorPanel component that visualizes connection state, message flow, subscription ref counts, and in-flight messages in real time.

Subscriptions

Multiple components subscribing to the same key share a single server subscription. The manager deduplicates automatically.

// chat-room.tsx
function useChatRoom(roomId: string) {
  useEffect(() => {
    manager.subscribe(`room:${roomId}`, {
      type: "join_room",
      roomId,
    })
    return () => {
      manager.unsubscribe(`room:${roomId}`, {
        type: "leave_room",
        roomId,
      })
    }
  }, [roomId])
}

If three components call subscribe("room:lobby"), the join message is sent once. When all three unmount, the leave message is sent once.

In-Flight Tracking

Tag a message with ackId and the manager holds it until you confirm delivery or the connection drops.

// send-with-ack.tsx
const id = crypto.randomUUID()

manager.send({
  data: { type: "place_order", item: "espresso" },
  ackId: id,
})

// When the server confirms:
manager.ackInFlight(id)

// If the connection drops before ack, onInFlightDrop fires
// with the list of unacknowledged messages.

Inspector

A built-in devtools panel for debugging WebSocket traffic. Ships as a separate export so it tree-shakes out of production builds.

// debug.tsx
import { InspectorPanel } from "@luciodale/react-socket/inspector"

function DevTools() {
  return <InspectorPanel manager={manager} />
}

Docs

Full documentation, configuration reference, and live examples at koolcodez.com/projects/react-socket.

License

MIT