Question

What is the best way to filter JSON nested keys and delete them? For example:

{ "id"    : "1",
  "key1"  : "val1",
  "key2"  : "val2",
  "name"  : "someone",
  "age"   : 39,
  "data"  : [
    { "id"    : "1234",
      "key1"  : "val1",
      "key2"  : "val2",
      "name"  : "someone",
      "age"   : 39
    },
    { "id"    : "1234",
      "key1"  : "val1",
      "key2"  : "val2",
      "name"  : "someone",
      "age"   : 39
    }
  ]
}

To get the following JSON by deleting all key1 and key2 items recursively:

{ "id"    : "1",
  "name"  : "someone",
  "age"   : 39,
  "data"  : [
    { "id"    : "1234",
      "name"  : "someone",
      "age"   : 39
    },
    { "id"    : "1234",
      "name"  : "someone",
      "age"   : 39
    }
  ] 
}

Thanks.

Answer 1

Something like this should work:

function deleteRecursive(data, key) {
    for(var property in data) {
        if(data.hasOwnProperty(property)) {
            if(property == key) {
                delete data[key];
            }

            else {
                if(typeof data[property] === "object") {
                    deleteRecursive(data[property], key);
                }
            }
        }         
    }
}

Fiddle here