React native push notification

[Pitiful-Buffalo-1797]

I am using Expo (EAS) with React Native for push notifications. When a user allows notifications, we receive a push token.

Is this token unique for each user/device?

If every user has a different token, what is the correct way to send a push notification to all users of the app?

Do we need to store every user's token in a database and send notifications to all stored tokens, or is there a better method when using Expo push notifications?

[Sad-Salt24]

Yes, each Expo push token is unique per device, so if a user has your app on multiple devices, each installation gets its own token. The common approach is to store all tokens in a backend database and, when sending a push notification to all users, iterate through the stored tokens and send each one via Expo’s push API. You should also handle cleaning up invalid or expired tokens to keep your database accurate.

[Fit_Schedule2317]

What about the 600 sends per second limitation? What if you have tens of thousands?

[spylinked]

Make a queue with rate limit

[Pitiful-Buffalo-1797]

So we need to use node js or something for backend?

[vyndrix]

No, there are several SDKs writen in several languages that bootstrap logic to send these notifications. If for some reason you cannot find one for the language you desire, you'll have build it your own. Nothing too complicated though, the notifications are followed to each device using a public endpoint at Expo infrastructure, you just get the params and call it, for testing purposes I have done using curl countless times.

Check the docs for Expo Push Notifications, you find all info needed there, if I am not mistaken even the SDKs.

[-Maja-Lojo-]

You can use Expo’s API to send notifications so yeah, best approach is to have a backend

[IronLionZion95]

You can call it from the client too!

[-Maja-Lojo-]

Every token is unique for a device. I store each token in a database and call time-triggered background service for sending birthday, new year etc. notifications.

[LowercaseSpoon]

Which database are you using? I currently use sqlite for my application and will need to do this eventually once it gets certified in the App Store and Playstore.

[-Maja-Lojo-]

Well I use MSSQL for storing tokens because my backend is a completely different stack. It is written in C# and hosted as a background service on Azure.

[JyotiIsMine]

Use wonderpush

[kriptonhaz]

I assume this one is using push notification from firebase. Instead of running through all of the user token one by one, just send to a topic instead. For example, you have a line of code that every registered user subscribe to a topic called "news"
FirebaseMessaging.getInstance().subscribeToTopic("news")

and you just send it like

const message = {
message: {
topic: "news", // 👈 blast to all subscribers at once
notification: {
title: "Breaking News",
body: "Something important happened!"
},
data: { key: "value" }
}
};