How to check string key is available in a JavaScript object

[chanikya]

Hi All,

How to check system property stringKeys are available in Object Or Not ?
I have below Object & Property  :

var myObject = {
"name": "ServiceNow",
"version": "Quebec",
"Year":"2025",
"Country":"Canada"
};

system property: StringKeys
name, year

// ---I tried below script which is working fine--//
var fields = gs.getProperty("StringKeys").split(',');
for(var key in fields) {
  if(fields[key] in myObject) {
      gs.info("Success ");
   }
}

Can you help me is there better way to check string keys available in Object Or not ?

[KrishnaMohan]

Hi @chanikya 

try below code

var myObject = {
"name": "ServiceNow",
"version": "Quebec",
"Year":"2025",
"Country":"Canada"
};


var fields =gs.getProperty("StringKeys");   // ex: "name,version"

 for (var key in myObject) {
        if (myObject.hasOwnProperty(key)) {
            if(fields.indexOf(key) != -1){
               gs.info(key + " is available in fields");
            }
        }}

If this helped to answer your query, please mark it helpful & accept the solution.
Thanks!
Krishnamohan

[chanikya]

Hi @KrishnaMohan 

can we use below format ? if(fields[key] in myObject)  

var fields = gs.getProperty("StringKeys").split(',');
for(var key in fields) {
  if(fields[key] in myObject) {

what is the benefit if we use  below

myObject.hasOwnProperty(fields[key]);

[M Iftikhar]

Hi Chanikya,

You can simplify your key check using hasOwnProperty and forEach like this:

var myObject = {
  "name": "ServiceNow",
  "version": "Quebec",
  "Year": "2025",
  "Country": "Canada"
};

gs.getProperty("StringKeys").split(',').forEach(function(key) {
    if (myObject.hasOwnProperty(key)) gs.info("Success: " + key + " exists");
});

This is cleaner, avoids for...in over arrays, and clearly shows which keys exist.

If you just want a single check for all keys:

var allExist = gs.getProperty("StringKeys").split(',').every(key => myObject.hasOwnProperty(key));
gs.info(allExist ? "All keys exist!" : "Some keys are missing!");

Using hasOwnProperty is the safest and most readable way to check object keys in ServiceNow scripts.
Hope this helps!

Thanks & Regards,
Muhammad Iftikhar
If my response helped, please mark it as the accepted solution so others can benefit as well.

[chanikya]

Hi @M Iftikhar 
can we use below format ? if(fields[key] in myObject)  

var fields = gs.getProperty("StringKeys").split(',');
for(var key in fields) {
  if(fields[key] in myObject) {

what is the benefit if we use  below

myObject.hasOwnProperty(fields[key]);