Firebase Cloud Messaging with Node.js - FCM 5

fcm5.js

const sendToAll = (msg, title, regIdArray, response) => {

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

    const folds = regIdArray.length % 1000

    for (let i = 0; i < folds; i++) {
        let start = i * 1000,
            end = (i + 1) * 1000

        data['registration_ids'] = regIdArray.slice(start, end).map((item) => {
            return item['token']
        })

        sendNotifications(data)
    }

    response.sendStatus(200)
}