Push notifications troubleshooting and FAQ

A collection of common questions about Expo push notification service.

A collection of common issues and FAQs when setting up push notifications with the expo-notifications library and Expo push notification service.

Expo push notification service FAQ

Cost of the push notification service

There is no cost associated with sending notifications through Expo push notification service.

Limit of sending notifications

There is a limit of 600 notifications per second per project that can be sent. If you exceed this rate, subsequent requests will fail until the rate falls below 600 per second again.

For best results, we recommend you add throttling (which is handled automatically in the expo-server-sdk-node) and retry logic to your server.

Using Expo push notification service is not mandatory

You can use any push notification service for Expo projects. The getDevicePushTokenAsync method from expo-notifications allows you to get the native device push token, which you can then use with other services, or even send your notifications directly through FCM and APNs.

Connections to notification service are encrypted

Expo's connections to Apple and Google are encrypted and use HTTPS.

Contents of the notification are not stored

Expo doesn't store the contents of push notifications any longer than it takes to deliver them to the push notification services operated by Google and Apple. Notifications are stored only in memory and in message queues, not in databases.

Contents of the notifications may be seen by Expo staff

If the Expo team is actively debugging the push notifications service, we may see notification contents (for example, at a breakpoint) but Expo cannot see push notification contents otherwise.

Delivery guarantees

Expo makes the best effort to deliver notifications to the push notification services operated by Google and Apple. Expo's infrastructure is designed for at-least-once delivery to the underlying push notification services. In some cases, a notification may be delivered to Google or Apple more than once or not at all, although these cases are rare.

After a notification has been handed off to an underlying push notification service, Expo creates a "push receipt" that records whether the handoff was successful. A push receipt denotes whether the underlying push notification service received the notification.

Finally, the push notification services from Google and Apple follow their policies to deliver the notification to the device.

When and why does the ExpoPushToken change

The ExpoPushToken remains the same across app upgrades. On Android, reinstalling the app may result in the token changing. On iOS, the token also remains the same even after uninstalling the app and reinstalling it.

It also changes if you change your applicationId or experienceId (usually @expoUsername/projectSlug).

The ExpoPushToken never expires. However, if one of your users uninstalls the app, you'll receive a DeviceNotRegistered error back from Expo's servers. This means you should stop sending notifications to this token.

Push notifications troubleshooting

Notifications aren't working

Push notifications have a lot of moving parts, so this can be due to a wide variety of reasons. To narrow things down, check the push ticket and push receipt for error messages.

You can also narrow things even further by testing local notifications in your app. This ensures all of your client-side logic is correct, and narrow things down to the server side or app credentials.

curl -H "Content-Type: application/json" -X POST "https://exp.host/--/api/v2/push/send" -d '{
  "to": "ExponentPushToken[xxxxxxxxxxxxxxxxxxxxxx]",
  "title":"hello",
  "body": "world"
}'

curl -H "Content-Type: application/json" -X POST "https://exp.host/--/api/v2/push/getReceipts" -d '{
  "ids": [
    "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
  ]
}'

Notifications work in development, but not in release mode

This indicates that you have either misconfigured your credentials or didn't configure them at all in your production app. Expo Go uses Expo's credentials, which allows working on notifications in development.

When you build your app for the app stores, you need to generate and use your own credentials. On Android, follow this guide. On iOS, this is handled by your push key (revoking the push key associated with your app results in your notifications failing to be delivered. To fix that, add a new push key with eas credentials).

For more information, see app signing.

Notifications occasionally stop coming through on Android

This is likely due to the priority level of the notifications you're sending. You can learn more about Android priority. Expo accepts four priorities:

• default: manually mapped to the default priority documented by Apple and Google
• high: mapped to the high priority level documented by Apple and Google
• normal: mapped to the normal priority level documented by Apple and Google
• (priority omitted): treated exactly as if default were specified

Setting the priority to high gives your notification the greatest likelihood that Android will display the notification.

Handle expired push notification credentials

When your push notification credentials have expired, run eas credentials, choose iOS and a build profile, then remove your push notification key and generate a new one.

Error message when sending a notification

Check the details property of the returned push ticket or receipt for more information. Read this for common error code responses and their associated solutions.

Fetching a push token takes a long time on iOS

getDevicePushTokenAsync and getExpoPushTokenAsync can sometimes take a long time to resolve on iOS. This is outside of expo-notifications's control, as stated in Apple's Troubleshooting Push Notifications technical note:

This is not necessarily an error condition. The system may not have Internet connectivity at all because it is out of range of any cell towers or Wi-Fi access points, or it may be in airplane mode. Instead of treating this as an error, your app should continue normally, disabling only that functionality that relies on push notifications.

Here are some ways our community members have resolved this issue:

Miscellaneous

Sending notifications directly through FCM and APNs

If you are not using Expo push notification service and instead, would like to communicate with Google and Apple directly, see Send notifications with FCM and APNs.

Notification icon on Android is a grey or white square

This indicates an issue with the image asset you're providing. The image should be all white with a transparent background (this is required and enforced by Google, not Expo). For more information, see this article.