This library is implemented JSON Pointer (http://tools.ietf.org/html/rfc6901) and some useful operator from JSON Patch (http://tools.ietf.org/html/rfc6902). JSON Pointer is available to identify a specified value in JSON document, and it is simillar to XPath. Please read the both of specifications for details. WWW: https://metacpan.org/release/JSON-Pointer