How to remove empty json object from nested json structure - json

Question

In my current JSON, I am getting an empty JSON object {} inside dummy_var5. The empty object is inside an array which is inside an object itself.
{
"dummy_var1": "abc",
"dummy_var2": [
{
"item": {
"action": "test",
"po": {
"id": "abc"
},
"ot": "test1",
"id": "1"
}
}
],
"dummy_var3": {
"dummy_var4": [
{
"name": "test",
"value": "test1"
},
{
"name": "test",
"value": "test1"
}
],
"name": "test2"
},
"dummy_var5": [
{
"ref": "test",
"name": "test1",
"type": null
},
{}
],
"dummy_var6": [
{
"role": "test",
"ref": "test1",
"partyDescription": "test2"
}
]
}
Considering this structure does not change, Is there any way to remove this via jolt. We tried using third party tool 'atlasmap' but couldn't achieve the desired result.
Expected output :-
{
"dummy_var1": "abc",
"dummy_var2": [
{
"item": {
"action": "test",
"po": {
"id": "abc"
},
"ot": "test1",
"id": "1"
}
}
],
"dummy_var3": {
"dummy_var4": [
{
"name": "test",
"value": "test1"
},
{
"name": "test",
"value": "test1"
}
],
"name": "test2"
},
"dummy_var5": [
{
"ref": "test",
"name": "test1",
"type": null
}
],
"dummy_var6": [
{
"role": "test",
"ref": "test1",
"partyDescription": "test2"
}
]
}

Answer 1

You can use this single shift transformation spec
[
{
"operation": "shift",
"spec": {
"*": "&", // the attributes other than "dummy_var5"
"dummy_var5": {
"*": {
"*": "&2.[&1].&"
}
}
}
}
]
the match "*":"&" of the line "*": "&2.[&1].&" returns the null value from the leaf node for this level, and so removes the innermost null object {}