Hi Dev Community

I thought i would share a little method I knocked together to traverse and compare 2 JSON objects for basic equivilance.   I'm currently working on some data migration, and wanted a basic sanity check to validate that the JSON output is basically equivliant between the old and new, excluding a few things like timestamps.  

It's a basic little recurvsive method, that will bubble up any differences over a nested structure.   It's very low tech, as that's all I need it to do, but I thought it might be useful for others?

It can accept a source and target JSON object or array, and optionally a RefNo if you are wanting to batch run this, and track the instances of differences in a ^zKeyTrap global. Additionally. there's an exclusion list for any keys which would would always expect to be differnt, such as ModificationTimestamps

ClassMethod CompareJSON(source As %String, target As %String, RefNo As %String = 1) As %Boolean
{
set Identical = 1
Set propsIteratorsource = source.%GetIterator()
While (propsIteratorsource.%GetNext(.key,.value)) {
  //Check for differences, and optionally exclude some keys
  if (value '= target.%Get(key)&&("LastModifiedTime,LocalTime"'[key)) { 
   if (source.%GetTypeOf(key)="object")||(source.%GetTypeOf(key)="array"){
     s tSC= ..CompareJSON(value,target.%Get(key),RefNo)  
   } else {
     w !,"Source ",key,?30,value
     w !,"Target ",key,?30,target.%Get(key)
     //Store a reference if running in Batch mode, for later review
     s ^zKeyTrap(key)=RefNo
     set tSC = 0 // A mismatch means key-value is not identical
   }
  // Multiply so that any zeros bubble up
  set Identical=(Identical*tSC) 
  }  
}    
q Identical
}

Please feel free to use and adapt this if it would be helpful in your use of JSON