how to send pushwoosh notification with nodejs?

I've studied the pushwoosh romote api,the basic process to send a notification is to post a piece of JSON data to http://cp.pushwoosh.com/json/1.3/createMessage and to be specific,the data will be packaged in the format like

 {'application' : PW_APPLICATION,
    'auth'      : PW_AUTH,
    'notifications':{
           'send_date' : 'now',
           'content'   : 'test',
           'data'      : {
                'custom' : 'json data'
            },
           'link' : 'http://pushwoosh.com/'
     }
 }

the pushwoosh guide lists serveral of sample codes in Java,PHP,Ruby and so on.I am quite confused that pushwoosh doesn't provide the nodejs version,so I have to carry it out by myself.I use the 'http' module to send the request and the parameters and part of main codes is shown below

var bodyArgs = 
{'application' : PW_APPLICATION,
    'auth'      : PW_AUTH,
    'notifications':{
           'send_date' : 'now',
           'content'   : 'test',
           'data'      : {
                'custom' : 'json data'
            },
           'link' : 'http://pushwoosh.com/'
     }
 }

var bodyArgsArray = [];
for (var i in bodyArgs) {
    if (bodyArgs.hasOwnProperty(i)) {
        if(typeof bodyArgs[i] == 'object'){
            bodyArgsArray.push(i + '=' + (JSON.stringify(bodyArgs[i])));
        }else{
            bodyArgsArray.push(i + '=' + (bodyArgs[i]));
        }
    }
}
var options = {
    host: 'cp.pushwoosh.com',
    method: 'POST',
    path: '/json/1.3/createMessage',
    headers: {'Content-Length': bodyStr.length,
    'Content-Type':'application/json',
    'Access-Control-Allow-Origin':'*'
}
var req = http.request(options, function (res){...});

unfortunately,I get the malformed response

[syntax error at end of input]

if the request is processed successfully, the correct response shoule be

{
    "status_code":200,
    "status_message":"OK",
    "response": {
        "Messages":["{Notification code}", "{Notification code}", ...]
    }  
}

I got a great desire to figure out the correct request format.I will be pretty appreciate of someone's nodejs version if possible!

And the pushwoosh remote-api-guide website is

https://www.pushwoosh.com/programming-push-notification/pushwoosh-push-notification-remote-api/