How to verify FCM registration token on server?

Question

I got my Firebase Cloud Messaging registration token for web push. And I sent this to my server to save in database for later push. But how can I verify this token is valid

Answer 1

If anyone using firebase Admin SDK for node.js, there is no need to manually send the request using the server_key explicitly. Admin SDK provide sending dry_run push message to verify the fcm_token.

function verifyFCMToken (fcmToken) => {
    return admin.messaging().send({
        token: fcmToken
    }, true)
}

Use this method like following

verifyFCMToken("YOUR_FCM_TOKEN_HERE")
.then(result => {
    // YOUR TOKEN IS VALID
})
.catch(err => {
    // YOUR TOKEN IS INVALID
})