WebSocket Tester
Test WebSocket, Socket.IO, and real-time connections. Connect, send messages, and inspect traffic.
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Connect to a WebSocket server and send a message
About WebSocket Tester
Developing and debugging real-time applications requires a reliable way to test WebSocket connections. Our free online WebSocket Tester provides a clean interface to connect to any WS/WSS endpoint, send messages, and monitor responses.
How It Works
The tool uses the browser's native WebSocket API to establish a persistent, bidirectional connection to the URL you provide. It logs all connection events, sent messages, and received data in a real-time console.
Common Use Cases
- Testing a newly deployed WebSocket server to ensure it accepts connections
- Debugging real-time chat applications or live data feeds
- Sending custom JSON payloads to a server to test specific event handlers
- Monitoring the latency and stability of a WebSocket connection
Frequently Asked Questions
Yes, you can connect to local endpoints (like ws://localhost:8080) as long as your browser allows it. Note that mixed content policies may prevent connecting to insecure 'ws://' endpoints from a secure 'https://' website.
The standard browser WebSocket API does not allow setting custom HTTP headers during the initial handshake. If your server requires authentication, you may need to pass tokens via the URL query string or as the first message.
WebSocket is a protocol that enables full-duplex communication between a client and server over a single TCP connection. Unlike HTTP, it allows real-time bidirectional data flow.
Yes, the tool supports both native WebSocket (ws://) and Socket.IO protocols. Select the protocol type and enter the server URL to connect.
You can send and receive plain text and JSON messages. The tool auto-formats JSON responses for readability.
The tool shows connection status, errors, and a message log. Check that the URL is correct, the server is running, and CORS policies allow the connection.