Web testing

WebSocket Tester

Connect to a WebSocket, send messages, and inspect the live log.

Only connect to endpoints you trust. Browser security (CORS/mixed content) may block some URLs.

Enter a ws:// or wss:// URL, connect from your browser, send text frames, and watch the connection log. Useful for debugging APIs, chat backends, and realtime services. The session runs entirely in your browser.

Disconnected
Connection log
How to use WebSocket Tester
WebSocket Tester — Connect to a WebSocket from your browser, send text frames, and read the live log. Free to use in D2i DevTools — no account required.
Steps
  1. Enter a WebSocket URL that starts with ws:// or wss://.
  2. Click Connect and wait until the log shows the socket is open.
  3. Type a text frame and send it. Messages you send and receive appear in the log.
  4. Click Disconnect when you are done. The session stays in your browser.
Frequently asked questions
What is WebSocket Tester used for?
Use it to debug a chat API, a realtime feed, or any ws:// or wss:// endpoint you are allowed to open.
How do I use the free online WebSocket Tester tool?
Enter a ws:// or wss:// URL and click Connect. When the log shows the socket is open, type a message and send it. Incoming frames appear in the same log. Disconnect when you finish.
What can I paste or upload into WebSocket Tester?
Type the socket URL in the page. After it connects, type the text frames you want to send. This tool does not add a subprotocol unless the endpoint accepts a plain connection.
What output does WebSocket Tester give me?
A log of the connection, the frames you send, and the frames you receive. Closing the socket appends that event too.
Does the WebSocket connection go through your server?
This tool runs in your browser only. WebSocket traffic goes directly between your device and the URL you enter — our servers never see the connection, messages, or credentials.
Why does the browser block my URL?
Pages served over HTTPS can be blocked from ws:// (mixed content). Use wss://. The endpoint must also allow your origin. Traffic does not pass through this site’s server.
 This tool runs in your browser only. WebSocket traffic goes directly between your device and the URL you enter — our servers never see the connection, messages, or credentials.