Basic use of JSONPath in Java

Java JsonPath API found at jayway JsonPath might have changed a little since all the above answers/comments. Documentation too. Just follow the above link and read that README.md, it contains some very clear usage documentation IMO.

Basically, as of current latest version 2.2.0 of the library, there are a few different ways of achieving what's been requested here, such as:

Pattern:--------String json = "{...your JSON here...}";String jsonPathExpression = "$...your jsonPath expression here..."; J requestedClass = JsonPath.parse(json).read(jsonPathExpression, YouRequestedClass.class);Example:--------// For better readability:  {"store": { "books": [ {"author": "Stephen King", "title": "IT"}, {"author": "Agatha Christie", "title": "The ABC Murders"} ] } }String json = "{\"store\": { \"books\": [ {\"author\": \"Stephen King\", \"title\": \"IT\"}, {\"author\": \"Agatha Christie\", \"title\": \"The ABC Murders\"} ] } }";String jsonPathExpression = "$.store.books[?(@.title=='IT')]"; JsonNode jsonNode = JsonPath.parse(json).read(jsonPathExpression, JsonNode.class);

And for reference, calling 'JsonPath.parse(..)' will return an object of class 'JsonContent' implementing some interfaces such as 'ReadContext', which contains several different 'read(..)' operations, such as the one demonstrated above:

/** * Reads the given path from this context * * @param path path to apply * @param type    expected return type (will try to map) * @param <T> * @return result */<T> T read(JsonPath path, Class<T> type);

Hope this help anyone.

There definitely exists a way to query Json and get Json back using JsonPath.See example below:

 String jsonString = "{\"delivery_codes\": [{\"postal_code\": {\"district\": \"Ghaziabad\", \"pin\": 201001, \"pre_paid\": \"Y\", \"cash\": \"Y\", \"pickup\": \"Y\", \"repl\": \"N\", \"cod\": \"Y\", \"is_oda\": \"N\", \"sort_code\": \"GB\", \"state_code\": \"UP\"}}]}"; String jsonExp = "$.delivery_codes"; JsonNode pincodes = JsonPath.read(jsonExp, jsonString, JsonNode.class); System.out.println("pincodesJson : "+pincodes);

The output of the above will be inner Json.

[{"postal_code":{"district":"Ghaziabad","pin":201001,"pre_paid":"Y","cash":"Y","pickup":"Y","repl":"N","cod":"Y","is_oda":"N","sort_code":"GB","state_code":"UP"}}]

Now each individual name/value pairs can be parsed by iterating the List (JsonNode) we got above.

for(int i = 0; i< pincodes.size();i++){    JsonNode node = pincodes.get(i);    String pin = JsonPath.read("$.postal_code.pin", node, String.class);    String district = JsonPath.read("$.postal_code.district", node, String.class);    System.out.println("pin :: " + pin + " district :: " + district );}

The output will be:

pin :: 201001 district :: Ghaziabad

Depending upon the Json you are trying to parse, you can decide whether to fetch a List or just a single String/Long value.

Hope it helps in solving your problem.

For those of you wondering why some of these years-old answers aren't working, you can learn a lot from the test cases.

As of September 2018, here's how you can get Jackson JsonNode results:

Configuration jacksonConfig = Configuration.builder()                              .mappingProvider( new JacksonMappingProvider() )                              .jsonProvider( new JacksonJsonProvider() )                              .build();JsonNode node = JsonPath.using( jacksonConfig ).parse(jsonString);