Firebase Cloud Messaging with Node.js - FCM 6

fcm6.js

app.post('/notify', (req, res) => {

    let msg = req.body.message,
        title = req.body.title,
        type = req.body.type,
        topic = req.body.topic

    if (type === 'topic') {
        sendToTopics(msg, title, topic, res)
    } else {
        MongoClient.connect(url, function (err, db) {
            if (err) throw err
            else {
                db.collection('tokens').find({}).toArray((err, docs) => {
                    sendToAll(msg, title, docs, res)
                })
            }
            db.close()
        })
    }
})

app.listen(8000)