Fetch JSON Object (#1506)

* Create script.js

* Update script.js

The script fetches a JSON object containing specified field values from a GlideRecord instance in ServiceNow.

* Create readme.md

Author: prynacshrma

Server Side/FetchJSONObject/readme.md

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+The `fetchJSONObject` function is designed to retrieve a JSON object containing specified field values from a GlideRecord instance in ServiceNow. 
+It allows for optional input of field names to fetch; if no fields are specified, all fields will be retrieved. 

Server Side/FetchJSONObject/script.js

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+function fetchJSONObject(gr, desiredFields /* optional */) {
+    // Ensure this is a valid GlideRecord
+    if (!(gr instanceof GlideRecord) || !gr.isValidRecord()) {
+        return {};
+    }
+
+    // Determine fields to retrieve; if none specified, get all fields
+    if (!Array.isArray(desiredFields) || desiredFields.length === 0) {
+        var gRU = new GlideRecordUtil();
+        desiredFields = gRU.getFields(gr); // Retrieves all field names for the record
+    }
+
+    var fieldValues = {};
+    // Use forEach to loop through the desired fields and add their values to the JSON object
+    desiredFields.forEach(function(fieldName) {
+        if (gr.isValidField(fieldName)) { // Ensure the field exists in the GlideRecord
+            var fieldValue = gr.getValue(fieldName);
+            fieldValues[fieldName] = fieldValue ? fieldValue : ''; // Use empty string if value is null
+        }
+    });
+
+    return fieldValues;
+}
+
+// Usage example:
+//var gr = new GlideRecord('incident');
+//gr.get('sys_id'); // Replace with an actual sys_id or use query methods to get a record
+//var jsonObject = fetchJSONObject(gr); // Optionally, add an array of specific fields as the second argument
+//gs.info(JSON.stringify(jsonObject)); // Logs the JSON object
+