I have a json array like bellow :
{
"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,
"likes": 1
},
{
"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}
I was trying to find all books price which have no likes field. Is it possible to find using Jayway Json Path library. I am trying something like this $.store.book[? (@.likes == null)].price
but i don't know whether there is anything like that?
This jsonpath expression is correct:
$.store.book[?(@.likes == null)].price
But you must set DEFAULT_PATH_LEAF_TO_NULL
, for example:
Configuration conf = Configuration.defaultConfiguration()
.addOptions(Option.DEFAULT_PATH_LEAF_TO_NULL);
String pricesForBooksWithNoLikes = JsonPath.using(conf).parse(json)
.read("$.store.book[?(@.likes == null)].price");
More details in the docs.
Here's a screenshot showing this read working, using the Jayway JsonPath Evaluator:
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