WebSocket Tester
Open a browser WebSocket connection to an authorized ws:// or wss:// endpoint, send text, JSON, or binary messages, and inspect received data and connection logs.
Connect
Enter URL and connect
Send & Receive
Exchange messages in real time
Inspect & Analyze
Review messages and stats
1. Connection
Comma-separated values passed to the browser WebSocket constructor.
2. Messages
No messages yet. Connect to a WebSocket server and send a message.
3. Inspect & Debug
Select a message to inspect it.
Event Listener
Receive OnlyListen for specific events on incoming messages. Match by JSON path ($.type == 'joined') or plain substring. Counters increment when messages match — listeners never send anything to the server.
What is WebSocket Tester?
Open a browser WebSocket connection to an authorized ws:// or wss:// endpoint, send text, JSON, or binary messages, and inspect received data and connection logs. An authorized ws:// or wss:// URL, optional subprotocols and query parameters, plus messages to send. Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
Open the tool
What the tool does
- Input: An authorized ws:// or wss:// URL, optional subprotocols and query parameters, plus messages to send.
- Controls and processing: Secure connection toggle, subprotocols, query parameters, auto-reconnect, system logs, text/JSON/binary sending, application ping, and receive-only JSON-path or substring listeners.
- Output: Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
How to use it
- Provide the input. An authorized ws:// or wss:// URL, optional subprotocols and query parameters, plus messages to send.
- Review the settings. Secure connection toggle, subprotocols, query parameters, auto-reconnect, system logs, text/JSON/binary sending, application ping, and receive-only JSON-path or substring listeners.
- Generate, inspect, and export. Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
Key features
- Input: An authorized ws:// or wss:// URL, optional subprotocols and query parameters, plus messages to send.
- Controls and processing: Secure connection toggle, subprotocols, query parameters, auto-reconnect, system logs, text/JSON/binary sending, application ping, and receive-only JSON-path or substring listeners.
- Output: Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
Useful workflows
- Open a browser WebSocket connection to an authorized ws:// or wss:// endpoint, send text, JSON, or binary messages, and inspect received data and connection logs.
- Use it when you need this deliverable or diagnostic result: Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
- Place it before the next verified workflow step: reproducing the exchange in the real client and correlating it with authorized server logs.
Limits and safety notes
- The browser WebSocket API cannot set arbitrary handshake headers or expose every low-level frame detail. “Ping” may be an application message rather than a protocol control frame. The target endpoint receives all connections/messages; use only authorized systems and redact tokens from exported logs.
Troubleshooting
- Use only an authorized public target; confirm the scheme, host, port, DNS/TLS, timeout, and temporary least-privilege credentials before retrying.
- Compare the result with target-side logs and an appropriate browser or CLI client; a timeout or server-side response alone does not prove the application configuration is correct.
- The browser WebSocket API cannot set arbitrary handshake headers or expose every low-level frame detail. “Ping” may be an application message rather than a protocol control frame. The target endpoint receives all connections/messages; use only authorized systems and redact tokens from exported logs.
Frequently asked questions
What is WebSocket Tester?
Open a browser WebSocket connection to an authorized ws:// or wss:// endpoint, send text, JSON, or binary messages, and inspect received data and connection logs.
How do I use WebSocket Tester?
Provide the expected input, review the page settings, then verify the result before copying or downloading it. Expected output: Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
What input does it accept?
An authorized ws:// or wss:// URL, optional subprotocols and query parameters, plus messages to send.
What output does it produce?
Connection state and system logs, sent/received message history, preview/raw/stats views, listener matches, and JSON export/copy.
What are the limits?
The browser WebSocket API cannot set arbitrary handshake headers or expose every low-level frame detail. “Ping” may be an application message rather than a protocol control frame. The target endpoint receives all connections/messages; use only authorized systems and redact tokens from exported logs.
Related AppKiro tools
Start with a verified input
Use an authorized non-production target and temporary or redacted data. Compare the result with target-side logs before acting on it.
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