Critical alerts from push notifications using JSON code

  • Release version: Yokohama
  • Updated January 30, 2025
  • 3 minutes to read
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    Summary of Critical alerts from push notifications using JSON code

    This content explains how ServiceNow customers can configure push notifications as critical alerts by adding specific JSON code. The setup varies between iOS and Android operating systems and includes special considerations for the IT Service Management (ITSM) business unit. Critical alerts ensure that notifications are delivered with high priority and sound, overriding typical device settings in some cases.

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    Key Features

    • JSON Code for Critical Alerts: Two main JSON components are required:
      • Push notification message structure: Defines the notification content.
      • JSON defining the notification as critical: Sets sound parameters and priority to trigger critical alert behavior.
    • Android Specific JSON: Includes a "priority":"high" setting within the sncGoogleKeys dictionary to wake devices for critical alerts.
    • Cross-platform JSON for Sound: The aps dictionary configures the alert sound with parameters:
      • critical: 1 to activate critical alert
      • name to specify the alert tone file (e.g., NotificationAlert-1.caf)
      • volume to set sound volume from 0.1 (quiet) to 1.0 (loud)
    • Predefined Alert Tones: Several dramatic and suspenseful tones are available to customize the critical alert sound.
    • ITSM Business Unit Support: If using the ITSM script include CriticalPushPayloadBuilder, critical alerts are supported without additional configuration. Adjustments to volume, name, or critical status must be done by modifying script include parameters, noting that changes affect all ITSM implementations and may be overwritten by upgrades.

    Important Considerations

    • On certain Android devices (e.g., OnePlus and Oppo), hardware and Do Not Disturb settings can affect the behavior of critical alerts, such as volume control limitations or temporary disabling of Do Not Disturb mode during alert playback.
    • Both iOS and Android JSON code must be included to support users on different platforms.
    • If no custom tone name is specified, the system defaults to the app’s ringtone or the device’s default ringtone.

    Practical Application for ServiceNow Customers

    By implementing the described JSON code in the Push message content area, ServiceNow customers can elevate push notifications to critical alerts, ensuring urgent messages receive immediate attention on mobile devices. This enhances incident response and communication effectiveness within ITSM workflows and other business use cases.

    You can make a push notification into a critical alert with the addition of some JSON code. Different JSON code is used for iOS and Android operating systems and for the ITSM business unit.

    Critical alert notifications require two code elements: the push notification message structure and the JSON code that defines the notification as a critical alert. Add this code in the Push message content area. For more information, see Create mobile critical alerts.

    Important:

    On the Android platform, when a user receives a critical alert on certain phone types, they may experience the following device behavior:

    OnePlus devices with hardware-controlled ringer mode:
    On devices like OnePlus where the ringer mode is controlled by a physical switch, the app might not be able to override the notification sound volume if the device is set to silent or vibrate mode.
    OnePlus or Oppo device Do Not Disturb mode behavior:
    On certain devices, like Oppo and OnePlus, if Do Not Disturb (DND) mode is enabled, the DND setting might be temporarily turned off until the critical notification sound has finished playing.

    Critical alert JSON to activate Android operating systems

    The following code must be added to the JSON code because it activates Android devices to wake up so that a critical alert can be triggered.
    Note:
    Because users use both iOS and Android devices you must add this code. The JSON entry in the code is a returned dictionary name value from the scripting.
     
    
    json["sncGoogleKeys"] = { 
              "android": { 
                  "priority": "high" 
              }, 
              "priority": "high" 
          }; 
    

    Critical alert JSON for all operating systems

    The following JSON must be added so that a notification behaves as a critical alert.

    var json = {};
    json["aps"] = { 
    "sound": {
              "critical": 1, 
              "name": "NotificationAlert-1.caf", 
              "volume": 1.0 
    }
          };
    
    The parameters in the sample JSON code are as follows:
    • The critical parameter defines the notification as a critical alert. 1 means the critical alert is active, 0 means the critical alert is inactive.
    • The name parameter is the name of the tone that is activated when a critical alert is sent. Some tones for critical alerts are listed in the table. For a complete list, see Configure sounds for push notifications.
      Accepted file name values Tone rhythm
      NotificationAlert-2.caf Dramatic
      NotificationAlert-2-Short.caf Dramatic
      NotificationAlert-9.caf Dramatic, Powerful
      NotificationAlert-9-Short.caf Dramatic, Powerful
      NotificationAlert-10.caf Dramatic, Suspenseful
      NotificationAlert-10-Short.caf Dramatic, Suspenseful
      Note:
      If a name value isn’t defined, the system uses the application’s default ringtone. If an application doesn't have a defined ringtone, then the system uses the device's default ringtone.
    • The volume parameter defines the volume of the critical alert sound. The range is from 0.1 as the quietest to 1.0 as the loudest.

    Example JSON code block for critical alert

    The following is a complete example block of JSON code that you must add and configure to activate a critical alert for Android and iOS devices.

    json["sncGoogleKeys"] = { 
              "android": { 
                  "priority": "high" 
              }, 
              "priority": "high" 
          }; 
      
    json["aps"]["sound"] = { 
              "critical": 1, 
              "name": "NotificationAlert-1.caf", 
              "volume": 1.0 
          };

    IT Service Management (ITSM) CriticalPushPayloader script include

    The Push message content area may contain previously configured code including the script include CriticalPushPayLoadBuilder, created by the ITSM business unit. If so, then no additional configuration is required for critical alerts. Script includes  are reusable server-side script logic that define a function or class.  CriticalPushPayLoadBuilder is a script include that contains functions to support critical alerts. The call of the script includes looks like this: CriticalPushPayloadBuilder (current, json, attributes).buildJSON()
    Note:
    If you're required change the values of the Volume or Name parameters, or change the alert from critical to non-critical, you must access the function parameters that the script include is getting as inputs.

    Changing the value of the critical alert script include affects all ITSM implementations of the script include. Similarly, an ITSM plugin upgrade could override your changes to your script include.