Install

npm install JSONPath

Evaluate

var jsonpath = require('JSONPath');
jsonpath.eval(obj, path);

Or more concisely:

var jsonpath = require('JSONPath').eval;
jsonpath(obj, path);

Examples

Given the following JSON, taken from http://goessner.net/articles/JsonPath/ :

{ "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
    }
  }
}

XPath	JSONPath	Result
/store/book/author	$.store.book[*].author	the authors of all books in the store
//author	$..author	all authors
/store/*	$.store.*	all things in store, which are some books and a red bicycle.
/store//price	$.store..price	the price of everything in the store.
//book[3]	$..book[2]	the third book
//book[last()]	$..book[(@.length-1)]	the last book in order.

                | $..book[-1:]           |

//book[position()<3]| $..book[0,1] | the first two books | $..book[:2] | //book[isbn] | $..book[?(@.isbn)] | filter all books with isbn number //book[price&lt;10] | $..book[?(@.price<10)] | filter all books cheapier than 10 //* | $..* |all Elements in XML document. All members of JSON structure.

See http://www.opensource.org/licenses/mit-license.php for license.