Free online WebSocket client debugger - Connect, send, receive, and debug WebSocket services
HTTP uses a request-response pattern where the client must initiate every communication. WebSocket is a full-duplex protocol — once connected, the server can push data to the client without waiting for a request. WebSocket is ideal for real-time chat, stock tickers, online gaming, and any scenario requiring real-time data push. The connection is established via an HTTP upgrade handshake.
ws:// is the unencrypted WebSocket protocol (like HTTP), while wss:// uses TLS/SSL encryption (like HTTPS). Production environments must use wss:// for security. ws:// should only be used for local development. Browsers block mixed content — HTTPS pages cannot connect to ws:// endpoints.
Common reasons: 1) Invalid URL format (must start with ws:// or wss://); 2) Server not running or wrong port; 3) CORS restrictions; 4) Mixed content blocking (HTTPS page + ws://); 5) Firewall or proxy blocking WebSocket; 6) Server doesn't support WebSocket protocol. Check URL format and server status first.
WebSocket Tester has no usage limits — it's free and unlimited. Since processing is done client-side, speed depends on your device. For very large files, we recommend processing in batches for the best experience.
No. WebSocket Tester is a web-based tool — just open it in your browser and start using it. No downloads, plugins, or extensions required.
Yes, WebSocket Tester is completely free to use. No registration or login required — all features are available immediately.
Yes. WebSocket Tester is fully responsive and works on phones, tablets, and desktops. The interface adapts automatically to your screen size.
No. WebSocket Tester uses client-side processing — everything runs in your browser. Your data never leaves your device, and the tool works even without an internet connection.