how to count length of the JSON array element [duplicate]
Solution 1:
Before going to answer read this Documentation once. Then you clearly understand the answer.
Try this It may work for you.
Object.keys(data.shareInfo[i]).length
Solution 2:
First if the object you're dealing with is a string then you need to parse it then figure out the length of the keys :
obj = JSON.parse(jsonString);
shareInfoLen = Object.keys(obj.shareInfo[0]).length;
Solution 3:
First, there is no such thing as a JSON object. JSON is a string format that can be used as a representation of a Javascript object literal.
Since JSON is a string, Javascript will treat it like a string, and not like an object (or array or whatever you are trying to use it as.)
Here is a good JSON reference to clarify this difference:
http://benalman.com/news/2010/03/theres-no-such-thing-as-a-json/
So if you need accomplish the task mentioned in your question, you must convert the JSON string to an object or deal with it as a string, and not as a JSON array. There are several libraries to accomplish this. Look at http://www.json.org/js.html for a reference.