WebSocket Tester

Test WebSocket connections — connect to any endpoint, send and receive messages in real-time

WebSocket Tester — Connect to WebSocket Endpoints, Send and Receive Real-Time Messages, and Debug Bidirectional Communication with Preset Echo Servers

  1. Enter a WebSocket URL — use wss:// for secure WebSocket connections (WebSocket over TLS, the standard for production) or ws:// for unencrypted connections (development/localhost only). Choose from preset endpoints for quick testing: the Echo Test preset (wss://ws.postman-echo.com/raw) echoes back any message you send — perfect for verifying connectivity and message round-trip; the Public Echo preset (wss://echo.websocket.org) provides an alternative public echo service. WebSocket is the foundational protocol for real-time web applications — chat systems, live dashboards, collaborative editing, gaming, financial tickers, and any application requiring server-to-client push without polling.
  2. Click Connect to establish the WebSocket connection. The connection status indicator shows the current state: Connecting (the WebSocket handshake is in progress — the browser sends an HTTP Upgrade request, and the server responds with HTTP 101 Switching Protocols), Connected (the bidirectional message channel is open — you can send and receive messages), or Disconnected (the connection is closed, with the close code and reason displayed). The connection timer tracks how long the current session has been active — useful for monitoring connection stability and detecting unexpected disconnections.
  3. Type your message in the input field and click Send or press Enter. The message log displays all communication in a color-coded timeline: green for sent messages, blue for received messages, gray for system events (connection opened, connection closed with code), and red for errors. Each log entry shows the timestamp, direction, and full message content — click any entry to inspect the raw data. Use the Clear Log button to reset the display for a new testing session. The WebSocket Tester is ideal for: debugging WebSocket API implementations, testing real-time features during development, verifying server upgrade handshake behavior, and learning the WebSocket protocol interactively. All communication is direct between your browser and the WebSocket server — no intermediary proxy or logging service.

Enable JavaScript to use these tools.