Karate websocket send request body replace token failed - karate

Question

I am using karate to test websocket, this worked:
Background:
* def token = TOKEN
* def handler = function(msg){ return msg.startsWith('a[')}
* def socket = karate.webSocket(WS_HOST + 'socket/761/f4t0so3p/websocket', handler)
Scenario: Demo Real
checking dcube-dev
* socket.send('{"type":"1ffe4b5d___AC_GET_MY_AVAILABLE_TASKS___N","token": "myhardcodedtoken","content":{"msg":null,"counter_api_enabled":false}}')
You can see here, I am hard coding the token inside the request body, not good, so I tried to move it out and use environment token instead as below:
Background:
* def token = TOKEN
* def handler = function(msg){ return msg.startsWith('a[')}
* def socket = karate.webSocket(WS_HOST + 'socket/761/f4t0so3p/websocket', handler)
Scenario: Demo Real
checking dcube-dev
* def body = {"type": "1ffe4b5d___AC_GET_MY_AVAILABLE_TASKS___N", "token": '#(token)', "content": {"msg":null,"counter_api_enabled":false} }
* print "Body:", body
* socket.send( '#(body)')
But this is always wrong, seemed the msg never sent out . Can anyone tell me how to resolve this issue?
Thanks

Answer 1

Actually I think you need to make this one change:
* socket.send(body)
Think of the round brackets as being JS - not standard Karate expressions: https://github.com/intuit/karate#enclosed-javascript
Also note, for strings (instead of JSON) you can use replace: https://github.com/intuit/karate#replace
* def text = 'hello <foo> world'
* replace text.foo = 'bar'
* match text == 'hello bar world'