why function returns object object, not string?

objectobject

spun = (msg) ->
	timestamp = gmdatenow()
	signature = get_signature(host, path, secret_key, access_key, timestamp, version)
	msg.http(scheme + "://" + host + path)
		.query
			timestamp: timestamp
			version: version
			access_key: access_key
			signature: signature
			type: 'json'
		.post(msg.match[1]) (err, res, body) ->
			if err
				msg.send err
			else if res.statusCode is not 200
				msg.send "Service not available! Status code: " + res.statusCode
			else
				# set to the memory so user can spin it with separate "spin the last spun" command
				body = JSON.parse(body)
				if body.response is 'error'
					msg.send body.message
					msg.send body.data
				else
					msg.send body.message
				body.message

my solution:

spun = (msg, spinner = null) ->
...
if spinner
msg.send spinner body.message
else
msg.send body.message