What is the method for determining the size of nested JSON data structures?

When I load a JSON into a variable, I encounter an issue in determining the length of the nested JSON.

var JVarible = [{"key":{"kind":"Comment","id":5992578889547776},"categoryId":0,"userName":"Shana Deepak","userId":"cpshana","comment":"hi.fghfghfgh ","createDate":"Sep 16, 2013 7:07:36 AM","url":"https://graph.facebook.com/100000840303512/picture?type\u003dsmall","networkType":"facebook","status":1,"nestmsgs":{"value":"[{\"key\":{\"kind\":\"Nestmsg\",\"id\":5914238686068736},\"commentId":5992578889547776,\"userName\":\"Shana Deepak\",\"userId\":\"cpshana\",\"message\":\"dfgdfgfdg\",\"createDate\":\"Sep 16, 2013 7:22:01 AM\",\"url\":\"https://graph.facebook.com/100000840303512/picture?type\\u003dsmall\",\"networkType\":\"facebook\",\"status\":0},{\"key\":{\"kind\":\"Nestmsg\",\"id\":5281469744283648},\"commentId":5992578889547776,\"userName\":\"Shana Deepak\",\"userId\":\"cpshana\",\"message\":\"gfdgdfgfd\",\"createDate\":\"Sep 16, 2013 7:12:25 AM\",\"url\":\"https://graph.facebook.com/100000840303512/picture?type\\u003dsmall\",\"networkType\":\"facebook\",\"status\":0}]"}}];


var i=0;

 for (i=0; i<JVarible.length;i++)
 {

 alert(JVarible[i].['nestmsgs'].length)

}
javascriptjson

Answer №1

Let's clarify a few things here - the variable JVarible actually holds a JavaScript array, not JSON data. However, inside this array, there is a specific value that is in fact JSON data (stored as a string).

It seems like you may be looking to count the number of messages within each object. The object nestmsgs contains a single property called value, which holds a JSON string.

To achieve your goal, you need to first parse the JSON string into an array and then find its length using the following code snippet: 

for (var j = 0; j < JVarible.length; j++) {
    var messageObject = JVarible[j].nestmsgs;
    messageObject.value = JSON.parse(messageObject.value);
    alert(messageObject.value.length);
}

Answer №2

Do you mean something along these lines?

Object.keys(dataSample[0]) //outputs ["id", "category", "name", "user_id", "content", "created_at", "link", "network", "active", "messages"]

Object.keys(dataSample[0]).length //equals 10

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