ServiceNow: retrieve a JSON Array element by its KEY value

 in this example, we wish to retrieve the blue highlighted key value from the JSON array tagsOfAffectedEntities:

{
  "ProblemDetailsJSON" : {
    "id" : "xxxx",
    "startTime" : 1652690280000,
    "endTime" : 1652690280000,
    "displayName" : "yyyy",
    "impactLevel" : "INFRASTRUCTURE",
    "status" : "CLOSED",
    "severityLevel" : "RESOURCE_CONTENTION",
    "commentCount" : 3,
    "tagsOfAffectedEntities" : [ {
      "context" : "CONTEXTLESS",
      "key" : "Application"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "SZCOFF",
      "value" : "SZCOFF12345"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "K8s container xxx",
      "value" : "xxxx"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "[Kubernetes]namespace",
      "value" : "xxx"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "Environment",
      "value" : "xxx"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "NS",
      "value" : "xxx"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "Tier"
    }, {
      "context" : "CONTEXTLESS",
      "key" : "Department",
      "value" : "xxx"
    } ],
  "ProblemID" : "xxx",
  "ProblemImpact" : "xxx",
  "ProblemSeverity" : "xxx",
  "ProblemTitle" : "xxx",
  "ProblemURL" : "https://xxxx.live.dynatrace.com/#problems/problemdetails;pid=-xxx",
  "State" : "RESOLVED",
  "Tags" : "xxx",
  "correlation_id" : "xxx",
  "name" : "xxx"
}

 

use this script:

var sPayload=JSON.parse (< above_payload>); //(assume it's stored in a ServiceNow table field such as em_alert.additional_info) 

example:

var grAlert=new GlideRecord('em_alert');
if (grAlert.get('number', 'Alert0017xxx')){

 
var sPayload=JSON.parse (grAlert.additional_info);

   var svc=_getSvcoffNumber(sPayload);

gs.print(svc);

function _getSvcoffNumber(additionalInfo) {
        
       
        var sReturn = '';
        try {
            var tagsOfAffectedEntities = additionalInfo.ProblemDetailsJSON.tagsOfAffectedEntities;
            sReturn=_extractTags(tagsOfAffectedEntities, "SZCOFF");
             
        } catch (ex) {
            
        }
        return sReturn;
    }

function  extractTags (pTagObject, pTag) {
        
        var vTag;
        try {
            for (i = 0; i < pTagObject.length; i++) {
                if (pTagObject[i]['key'] == pTag) {
                    vTag = pTagObject[i]['value'].toString();
                }
            }
        } catch (ex) {
           
        }
        return vTag;
    }

 ---OUTPUT:

*** Script: SZCOFF12345

 (ServiceNow )