What is WebSocket Tester?

WebSocket Tester is a browser-based utility to connect to ws:// or wss:// endpoints, send payloads, and inspect real-time responses with structured logs.

Can I test socket subprotocols?

Yes. Enter comma-separated subprotocol values and reconnect. The browser includes them during the WebSocket handshake.

Does this tool store my data?

No. Messages and logs stay in your browser session and are not uploaded by this tool.

Can I use this for production incident debugging?

Yes. It is useful for quickly reproducing connection issues, comparing payload behavior, and collecting copyable logs for incident notes.

WebSocket Tester

Open a WebSocket connection to any ws:// or wss:// endpoint, send text or JSON payloads, and inspect incoming messages with timestamped logs. Free online realtime API testing tool.

WebSocket Tester

Connect to any WebSocket endpoint, send messages, and inspect live responses directly in your browser. Great for API debugging, event stream testing, and real-time integration checks.

WebSocket URL

Subprotocols (optional)

Disconnected

Message Payload

Message Type

Live event log (0/250)

No events yet. Connect to a socket and send a message.

Features

Everything needed to test and debug WebSocket endpoints in-browser

Instant WebSocket Connect

Open and close WebSocket sessions in one click with clear live connection state.

Real-Time Message Flow

Send text or JSON payloads and inspect incoming messages with timestamped logs.

Protocol and Payload Controls

Test optional subprotocols and validate JSON payloads before sending.

Copy Full Session Logs

Copy complete event history for bug reports, QA notes, and team debugging.

Use Cases

Common scenarios where a browser WebSocket tester saves development time

Realtime API Debugging

Verify payload contracts and server responses for chat, live feed, or collaboration APIs.

QA Environment Validation

Smoke test staging socket endpoints without writing custom frontend scripts.

Incident Triage

Capture quick reproduction logs when message delivery or connection drops fail in production.

Protocol Experiments

Try alternate payload formats and subprotocol values during backend integration.

About WebSocket Tester

Fast browser-based utility for testing ws:// and wss:// endpoints

How this tool works

When to use this

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Frequently Asked Questions

Quick answers for testing and troubleshooting WebSocket endpoints

Yes. The tester supports both unsecured ws:// and secure wss:// endpoints. When you provide http/https URLs, the tool converts them automatically to ws/wss.

Yes. Switch Message Type to JSON and the tool validates your payload before sending so malformed JSON is caught immediately.

Common reasons include invalid URL, server offline state, authentication requirements, TLS certificate issues, or endpoint restrictions that reject browser-origin connections.

Yes. Add a comma-separated subprotocol list in the Subprotocols field and reconnect. The browser will include them in the handshake.

Yes. Use Copy Logs to copy all events with timestamps and message direction, then paste into bug trackers or team chat.