Why does connecting to a ws:// address fail?

If this page is opened via HTTPS, the browser will block plaintext connections to ws:// due to security policies (mixed content). Please use an encrypted wss:// address; for local debugging, you can use ws://localhost.

Can I send binary messages?

This tool focuses on text message sending and receiving. Content in the send box will be sent as a string. Received binary frames will be indicated with a placeholder showing their size, but their byte content will not be displayed.

What causes the connection to keep failing?

Common causes include: misspelled address or incorrect port, server not running, server not allowing the current origin (Origin), or network/firewall blocking. Browsers do not expose failure details due to security restrictions; you can check server logs for troubleshooting.

WebSocket Debugger

100% local processing

WebSocket Address

Disconnected

Send Message

Message Log

After connecting, sent and received messages will be displayed here in chronological order.

FAQ

No. The connection is established directly by your browser with the target WebSocket server. All messages travel between your device and the target server without passing through any qktools servers, and we do not log message content.

What is a WebSocket Debugger

A WebSocket debugger is an online development aid tool that allows you to quickly connect to a WebSocket server and send/receive messages in real-time to verify the handshake, push, and bidirectional communication, without writing your own test code.

The connection is initiated by the browser's native WebSocket interface, directly connecting to the ws/wss address you provide. Messages are transmitted only between your device and the target server; qktools does not forward or record any content.

How to Use

1Enter the target WebSocket address in the address bar (e.g., wss://example.com/socket) and click 'Connect'.
2After the status indicator changes to 'Connected', enter text in the send box and click 'Send'.
3Sent and received messages are displayed in chronological order in the message log: green for received, brand color for sent, and gray for system prompts.
4After debugging, click 'Disconnect' to close the connection, or use 'Clear' to clean up the log.

Why Choose qktools WebSocket Debugger

Privacy first: The connection is direct to the target server; messages do not pass through our servers.

No installation required: Use directly in your browser, no need to install a client or register an account.

Clear information: Messages include direction indicators and timestamps, making it easy to verify send/receive timing.