filter the Json according to string in an array in JSONPATH

Question

I have a situation where I have json String that has a child as Array that contains only Strings. Is there as way I can get the object reference of the arrays that contains a specific String. Example:

{ "Books":{  
      "History":[  
         {  
            "badge":"y",
            "Tags":[  
               "Indian","Culture"
            ],
            "ISBN":"xxxxxxx",
            "id":1,
            "name":"Cultures in India"
         },
         {  
            "badge":"y",
            "Tags":[  
               "Pre-historic","Creatures"
            ],
            "ISBN":"xxxxxxx",
            "id":1,
            "name":"Pre-historic Ages"
         }
     ]
  }
}

To Achieve: From the above JSON String, need to get all books in History which contains "Indian" inside the "tags" list.

I am using JSONPATH in my project but If there is other API that can provide similar functionality, any help is welcome.

Answer 1

Assuming you are using Goessner JSONPath (http://goessner.net/articles/JsonPath/) the following should work:

$.Books.History[?(@.Tags.indexOf('Indian') != -1)]

According to the Goessner site, you can use underlying JavaScript inside the ?() filter. You can therefore use the JavaScript indexOf function to check if your Tags array contains the tag 'Indian'.

See a working example here using this JSONPath query tester: http://www.jsonquerytool.com/sample/jsonpathfilterbyarraycontents

Answer 2

If you're using Goessner JSONPath, $.Books.History[?(@.Tags.indexOf('Indian') != -1)] as mentioned by Duncan above should work.

If you're using the Jayway Java port (github.com/jayway/JsonPath), then $.Books.History[?(@.Tags[?(@ == 'Indian')] != [])] or more elegantly, use the in operator like this $.Books.History[?('Indian' in @.Tags)]. Tried them both here.

Answer 3

Did you try to use underscoreJS ? You can get the Indian books like this :

var data = {"Books:"....};

var indianBooks = _.filter(data.Books.History, function(book) { return _.contains(book.Tags, "Indian"); })