This is to convert list of dictionary which will have child- parent relation to each other. This will convert to nested hierarchy

nested-json-tree-based.py

data = [
 { "name" : "ABC", "parent":"DEF",  },
 { "name" : "DEF", "parent":"null" },
 { "name" : "new_name", "parent":"ABC" },
 { "name" : "new_name2", "parent":"ABC" },
 { "name" : "Foo", "parent":"DEF"},
 { "name" : "Bar", "parent":"null"},
  { "name" : "Chandani", "parent":"new_name", "relation": "rel", "depth": 3 },
  { "name" : "Chandani333", "parent":"new_name", "relation": "rel", "depth": 3 }
]

result = {x.get("name"):x for x in data}
#print(result)
tree = [];
for a in data:
    #print(a)
    if a.get("parent") in result:
        parent = result[a.get("parent")]
    else:
        parent = "" 
    if parent:
        if "children" not in parent:
            parent["children"] = []
        parent["children"].append(a)
    
    else:
        tree.append(a)
        

print(tree)