删除json元素

import json

json_str = '{"name": "John", "age": 30, "city": "New York"}'
json_obj = json.loads(json_str)

del json_obj['city']

json_str_new = json.dumps(json_obj)
print(json_str_new)

{"name": "John", "age": 30}

const json_obj = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

delete json_obj.city;

console.log(json_obj);

{ name: 'John', age: 30 }

import org.json.JSONObject;

public class Main {
    public static void main(String[] args) {
        JSONObject json_obj = new JSONObject("{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}");
        json_obj.remove("city");
        System.out.println(json_obj.toString());
    }
}

{"name":"John","age":30}

$json_str = '{"name": "John", "age": 30, "city": "New York"}';
$json_obj = json_decode($json_str, true);

unset($json_obj['city']);

$json_str_new = json_encode($json_obj);
echo $json_str_new;

{"name":"John","age":30}