A collection of common questions about Expo's push notification service.
A collection of common issues and FAQs when setting up push notifications with the expo-notifications
library and Expo's push notification service.
There is no cost associated with sending notifications through Expo's classic push notification service.
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.
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.
Expo's connections to Apple and Google are encrypted and use HTTPS.
Expo doesn't store the contents of push notifications any longer than it takes to deliver the notifications to the push notification services operated by Apple, Google, and so on. Notifications are stored only in memory and in message queues and not stored in databases.
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.
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, Apple, and so on follow their policies to deliver the notification to the device.
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 will ensure 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"
}'
id
to request the push receipt:curl -H "Content-Type: application/json" -X POST "https://exp.host/--/api/v2/push/getReceipts" -d '{
"ids": [
"XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
]
}'
ExpoPushToken
changeThe ExpoPushToken
will remain the same across app upgrades. On iOS, it will also remain the same even after uninstalling the app and reinstalling it. On Android, this results in the push token changing.
It will also change if you change your applicationId
or experienceId
(usually @expoUsername/projectSlug
).
The ExpoPushToken
will never expire. 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 app.
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 will result in your notifications failing to be delivered. To fix that, add a new push key with eas credentials
).
For more information, see app signing.
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 Googlehigh
: mapped to the high priority level documented by Apple and Googlenormal
: mapped to the normal priority level documented by Apple and Googledefault
were specifiedAnd setting the priority to high
gives your notification the greatest likelihood that the Android will display the notification.
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.
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.
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:
Read Apple's Technical Note on troubleshooting push notifications! This is the single most reliable source of information on this problem. To help you grasp what they're suggesting:
You may need to disable network sharing as this may impact the registration as suggested by this Stack Overflow answer.
If you just changed the APNS servers where the app should be registering (by installing a TestFlight build over an Xcode build on the same device) you may need to restart your device as suggested by this Stack Overflow answer.
If the device you're experiencing this on hasn't been setup with a SIM card it looks like configuring it may help mitigate this bug as suggested by this Stack Overflow answer.
If you are not using Expo's push notification service and instead, would like to communicate with Google and Apple directly, see Send notifications with FCM & APNs, paying special attention to the payload formats, since providing different formats can result in unexpected behavior on both platforms.
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.
The Expo push notification service currently doesn't support custom sounds. You will need to use FCM and APNs directly with the native device tokens received from expo-notifications
in standalone apps.
LegacyNotifications
libraryFor more information on how to migrate from Expo's LegacyNotifications
library to use expo-notifications
, see the migration guide.