WebSocket Tester
Open a live WebSocket connection, send frames and read replies.
The socket is opened directly by your browser — no relay, no server of ours in the middle. Pages served over HTTPS can only connect to wss:// endpoints.
Message
Transcript
- No frames yet — connect and send a message.
About the WebSocket Tester
Connect to any ws:// or wss:// endpoint straight from your browser, send text or JSON frames and watch every message arrive in a colour-coded transcript with timestamps, sent and received counters and close codes. It uses the native WebSocket API, so the connection is between your tab and the server only — no relay, no logging, nothing stored.
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Frequently asked questions
Read more
- Debugging WebSockets: handshake, close codes, and reading a transcript
How to test a ws:// or wss:// endpoint from the browser, and what the common close codes actually mean.
Version 1.0.0 · Updated 2026-08-13 · Runs entirely in your browser