Extract values from JSON by dot-path (e.g. user.name).
$ 表示根,点号取属性($.a.b),方括号取下标($.list[0])。* 遍历数组全部元素或对象全部成员,配合下标可批量取值。| Item | Formula / Note | Source / Standard |
|---|---|---|
| Root and children | $ root, .name member, [n] array index | RFC 9535 (JSONPath) |
| Recursive descent | .. matches descendants at any depth | RFC 9535 |
| Filters | ?() supports comparison, existence and logic | RFC 9535 |