The jsonpointer extension implements the IETF standard JavaScript Object Notation (JSON) Pointer
| contains | Returns `true` if the json document contains the given json pointer |
| get | Get a value from a JSON document using Json Pointer path notation. |
| insert | Inserts a value in a JSON document using Json Pointer path notation, if the path doesn't specify an object member that already has the same key. |
| insert_or_assign | Inserts a value in a JSON document using Json Pointer path notation, or if the path specifies an object member that already has the same key, assigns the new value to that member. |
| remove | Removes a value from a JSON document using Json Pointer path notation. |
| replace | Replaces a value in a JSON document using Json Pointer path notation. |