FCM delivers duplicated copies of Push Notifications - node.js

Question

I am using fcm node modules to send push notifications. Tried to send to a group(group with one device token). And all it delivers duplicated copies(4 copies everytime) of the same push for a single alert. It was supposed to be delivered only one. I have used fcm-node (version: 1.2.1), fcm-push (version: 1.1.3) etc.
The nodejs code is as shown below:
Alerts.pushTry = function (cb) {
var serverKey = "abcd"; //put your server key here
var deviceToken = 'group_key'; // required
var FCM = require('fcm-node');
var message = { //this may vary according to the message type (single recipient, multicast, topic, et cetera)
to: deviceToken,
notification: {
title: 'Group 555 test'+ ((new Date()).getTime()),
body: 'Body of your push notification'
},
data: {
my_key: 'my value',
my_another_key: 'my another value'
}
};
fcm.send(message, function(err, response) {
console.log("sent");
if (err) {
console.log(err);
console.log("Something has gone wrong!");
cb(err);
} else {
console.log("Successfully sent with response: ", response);
cb(null, response);
}
});
};
Can anyone help me?

Answer 1

There are some open issues exists for the above mentioned node modules.. I have used the request module and connected the fcm push notification url directly without depending on these types of npm modules with open issues.
var request = require('request');
request({
url: 'fcm.googleapis.com/fcm/send',
method: "POST",
headers: { "content-type" : "application/json",
"Authorization": key=${constants.FCM_SERVER_KEY},
"project_id": constants.FCM_SENDER_ID, },
json: message
}, function(error, response, body) {
//You code
});