Firebase Cloud Messaging with Node.js - FCM 4

fcm4.js

const sendToTopics = (msg, title, topic, response) => {

    const data = {
        "data": {
            "body": msg,
            "title": title
        }
    }

    data['to'] = '/topics/' + topic

    sendNotifications(data)

    response.sendStatus(200)
}