Developer Tools
Push Notification Payload Validator
Validate FCM (Android) and APNs (iOS) push notification JSON payloads.
Free foreverRuns in your browserNo sign-up
Payload structure looks valid.
Checks the required structure (aps for APNs, message/notification/data for FCM). It validates shape, not delivery.
About the Push Notification Payload Validator
Push notifications are sent as JSON payloads with a specific structure. A missing key like aps or message often causes silent failures.
This tool validates the shape of Firebase Cloud Messaging (FCM) and Apple Push Notification service (APNs) payloads, pointing out errors and common warnings.
It checks structure, not delivery, and runs entirely in your browser.
Key features
- FCM (Android) and APNs (iOS) modes
- Checks required keys like aps and message
- Warns about missing title or body
- Local, private validation
How to use
- 1Choose FCM or APNs.
- 2Paste your JSON payload.
- 3Read the validation result, errors and warnings.
Examples
APNs alert
Input:
{ "aps": { "alert": { "title": "Hi" } } }Output:
Payload structure looks valid.The required aps dictionary with an alert title passes validation.
Frequently asked questions
- What does an APNs payload need?
- A top-level aps dictionary. To show an alert it should include an alert (with a title or body), a badge, a sound, or content-available for a silent push.
- What does an FCM payload need?
- A notification and/or data field. In the HTTP v1 API these sit inside a top-level message object.
- Does it send the notification?
- No. It only validates the JSON structure. It never sends anything, so payloads with tokens stay on your device.