Firebase Cloud Messaging with Node.js - FCM 3

fcm3.js

const sendNotifications = (data) => {

    const dataString = JSON.stringify(data)

    const headers = {
        'Authorization': 'key=<your firebase legacy server key>',
        'Content-Type': 'application/json',
        'Content-Length': dataString.length
    }

    const options = {
        uri: 'https://fcm.googleapis.com/fcm/send',
        method: 'POST',
        headers: headers,
        json: data
    }

    request(options, function (err, res, body) {
        if (err) throw err
        else console.log(body)
    })
}