JSON Paths

How to use Jayway JsonPath in the JSON Parser placeholder.

JSON Paths in FancyMenulink

FancyMenu's JSON Parser placeholder uses Jayway JsonPath to get content from JSON files.
This page explains JSON paths in detail.

The text on this page is a copy of the README from Jayway JsonPath's GitHub repository.

JsonPathlink

JsonPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination
with an XML document. The "root member object" in JsonPath is always referred to as $ regardless if it is an
object or array.

JsonPath expressions can use the dot–notation

$.store.book[0].title

or the bracket–notation

$['store']['book'][0]['title']

Operatorslink

OperatorDescription
$The root element to query. This starts all path expressions.
@The current node being processed by a filter predicate.
*Wildcard. Available anywhere a name or numeric are required.
..Deep scan. Available anywhere a name is required.
.<name>Dot-notated child
['<name>' (, '<name>')]Bracket-notated child or children
[<number> (, <number>)]Array index or indexes
[start:end]Array slice operator
[?(<expression>)]Filter expression. Expression must evaluate to a boolean value.

Functionslink

Functions can be invoked at the tail end of a path - the input to a function is the output of the path expression.
The function output is dictated by the function itself.

FunctionDescriptionOutput type
min()Provides the min value of an array of numbersDouble
max()Provides the max value of an array of numbersDouble
avg()Provides the average value of an array of numbersDouble
stddev()Provides the standard deviation value of an array of numbersDouble
length()Provides the length of an arrayInteger
sum()Provides the sum value of an array of numbersDouble
keys()Provides the property keys (An alternative for terminal tilde ~)Set<E>
concat(X)Provides a concatinated version of the path output with a new itemlike input
append(X)add an item to the json path output arraylike input

Filter Operatorslink

Filters are logical expressions used to filter arrays. A typical filter would be [?(@.age > 18)] where @ represents the current item being processed. More complex filters can be created with logical operators && and ||. String literals must be enclosed by single or double quotes ([?(@.color == 'blue')] or [?(@.color == "blue")]).

OperatorDescription
==left is equal to right (note that 1 is not equal to '1')
!=left is not equal to right
<left is less than right
<=left is less or equal to right
>left is greater than right
>=left is greater than or equal to right
=~left matches regular expression [?(@.name =~ /foo.*?/i)]
inleft exists in right [?(@.size in ['S', 'M'])]
ninleft does not exists in right
subsetofleft is a subset of right [?(@.sizes subsetof ['S', 'M', 'L'])]
anyofleft has an intersection with right [?(@.sizes anyof ['M', 'L'])]
noneofleft has no intersection with right [?(@.sizes noneof ['M', 'L'])]
sizesize of left (array or string) should match right
emptyleft (array or string) should be empty

Path Exampleslink

Given the json

{
    "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
        }
    },
    "expensive": 10
}
JsonPath (click link to try)Result
$.store.book[*].authorThe authors of all books
$..authorAll authors
$.store.*All things, both books and bicycles
$.store..priceThe price of everything
$..book[2]The third book
$..book[-2]The second to last book
$..book[0,1]The first two books
$..book[:2]All books from index 0 (inclusive) until index 2 (exclusive)
$..book[1:2]All books from index 1 (inclusive) until index 2 (exclusive)
$..book[-2:]Last two books
$..book[2:]Book number two from tail
$..book[?(@.isbn)]All books with an ISBN number
$.store.book[?(@.price < 10)]All books in store cheaper than 10
$..book[?(@.price <= $['expensive'])]All books in store that are not "expensive"
$..book[?(@.author =~ /.*REES/i)]All books matching regex (ignore case)
$..*Give me every thing
$..book.length()The number of books