Using JSONPath Syntax

Introduction

The syntax and examples with slight changes are taken from the jsonpath Github and are adapted from Stefan Goessner’s original post.

JSONPath	Description
$	The root object/element
@	The current object/element
.	Child member operator
..	Recursive descendant operator; JSONPath borrows this syntax from E4X
*	Wildcard matching all objects/elements regardless their names
[]	Subscript operator
[,]	Union operator for alternate names or array indices as a set
[start:end:step]	Array slice operator borrowed from ES4 / Python
?()	Applies a filter (script) expression via static evaluation
()	Script expression via static evaluation

Given this sample data set, see example expressions below:

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

Example JSONPath expressions:

JSONPath	Description
$.store.book[*].author	The authors of all books in the store
$..author	All authors
$.store.*	All things in store, which are some books and a red bicycle
$.store..price	The price of everything in the store
$..book[2]	The third book
$..book[(@.length-1)]	The last book via script subscript
$..book[-1:]	The last book via slice
$..book[0,1]	The first two books via subscript union
$..book[:2]	The first two books via subscript array slice
$..book[?(@.isbn)]	Filter all books with isbn number
$..book[?(@.price<10)]	Filter all books cheaper than 10
$..book[?(@.price==8.95)]	Filter all books that cost 8.95
$..book[?(@.price<30 && @.category=="fiction")]	Filter all fiction books cheaper than 30
$..*	All members of JSON structure

To easily test those examples you can use the jsonPath online evaluator.