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⚠️ This is the archived documentation for k6 v0.44. Go to the latest version.

A module with a better and standard API exists

The new k6/experimental/websockets API partially implements the WebSockets API living standard.

When possible, we recommend using the new API. It uses a global event loop for consistency with other k6 APIs and better performance.

The ws module provides a WebSocket client implementing the WebSocket protocol.

FunctionDescription
connect( url, params, callback )Create a WebSocket connection, and provides a Socket client to interact with the service. The method blocks the test finalization until the connection is closed.
Class/MethodDescription
ParamsUsed for setting various WebSocket connection parameters such as headers, cookie jar, compression, etc.
SocketWebSocket client used to interact with a WS connection.
Socket.close()Close the WebSocket connection.
Socket.on(event, callback)Set up an event listener on the connection for any of the following events:
- open
- binaryMessage
- message
- ping
- pong
- close
- error.
Socket.ping()Send a ping.
Socket.send(data)Send string data.
Socket.sendBinary(data)Send binary data.
Socket.setInterval(callback, interval)Call a function repeatedly at certain intervals, while the connection is open.
Socket.setTimeout(callback, period)Call a function with a delay, if the connection is open.