This is an implementation of JSONPath in Scala. The library follows the semantics describted by Stefan Goessner on his blog. Although, due to the lack of standardization, it is worth reading the following documentation.

In a JSONPath expression, the abstract name $ is used to designate to the outer level object.

JSONPath expressions can use the dot–notation $.store.book[0].title or the bracket–notation $['store']['book'][0]['title'].

Based on the following JSON document :

{ "store": {
    "book": [
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "Evelyn Waugh",
        "title": "Sword of Honour",
        "price": 12.99
      },
      { "category": "fiction",
        "author": "Herman Melville",
        "title": "Moby Dick",
        "isbn": "0-553-21311-3",
        "price": 8.99
      },
      { "category": "fiction",
        "author": "J. R. R. Tolkien",
        "title": "The Lord of the Rings",
        "isbn": "0-395-19395-8",
        "price": 22.99
      }
    ],
    "bicycle": {
      "color": "red",
      "price": 19.95
    }
  }
}

Here is a list of supported operators :

The underlying engine for writing filter expressions currently support two different kinds of filter expression:

You can also combine them with boolean operators, eg: $.store.book[?(@.price < 10 && @.price >4)].title

This implementation currently relies on Json-Smart for parsing the JSON document. The library can easily be adapted to use different JSON providers.

JsonPath.query("$.a", """{"a":"A","b":"B"}""") gives you Right(non-empty iterator). This will allow you to iterate over all possible solutions to the query.

eg : JsonPath.query("$.a", """{"a":"A","b":"B"}""").right.map(_.toVector) gives you Right(Vector("A"))

Conclusion: not as fast as Jayway on compilation (to be expected due to Parser Combinators). However, that doesn't matter once compiled and cached (like in Gatling). Graph traversal can be even better on some complex use cases (like the last one).

This library is licensed under the Apache License, Version 2.0