Can I test wss:// secure WebSockets?

Yes. Enter a wss:// URL. The browser enforces TLS and same-origin/CORS policies of the target server.

Why does my connection fail?

Common causes include invalid certificates, server not accepting browser origins, auth headers missing, or corporate proxies blocking WebSockets.

Can I send JSON payloads?

Yes. Type or paste JSON/text frames in the composer and send them to the open socket.

Is my data uploaded when I use WebSocket Tester?

No. WebSocket Tester runs entirely in your browser. Your input never leaves your device.

Does it support subprotocols?

If exposed in the UI, you can pass Sec-WebSocket-Protocol values supported by your server.

WebSocket Tester

Network Live

Connect to WebSocket endpoints and send/receive messages.

About this tool

WebSocket Tester — Connect to WebSocket endpoints and send/receive messages. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Examples

Common scenarios for the WebSocket Tester.

Echo server

url: wss://echo.example.com

Connected — sent payloads appear in the message log.

Who uses the WebSocket Tester?

Common scenarios and audiences for this tool.

Backend developers

Use the tool for backend developers workflows without leaving the browser.

QA engineers

Speed up qa engineers tasks with instant local processing.

Chat app builders

Handle chat app builders checks during development or review.

IoT integrators

Support iot integrators with a private, signup-free utility.

API testers

Ideal for api testers when you need quick, repeatable results.

Frequently asked questions

Everything you need to know about the WebSocket Tester.