Count Key/Values in JSON [duplicate]

Question

Possible Duplicate:
Length of Javascript Associative Array

I have a JSON that looks like this:

Object:    www.website1.com : "dogs"    www.website2.com : "cats"    >__proto__ : Object 

This prints when I do this:

console.log(obj); 

I am trying to get the count of the items inside this JSON, obj.length returns "undefined" and obj[0].length returns

Uncaught TypeError: Cannot read property 'length' of undefined

I would expect a length to return "2" in this case. How can I find the count?

Thanks!

Answer 1

You have to count them yourself:

function count(obj) {    var count=0;    for(var prop in obj) {       if (obj.hasOwnProperty(prop)) {          ++count;       }    }    return count; } 

Although now that I saw the first comment on the question, there is a much nicer answer on that page. One-liner, probably just as fast if not faster:

function count(obj) { return Object.keys(obj).length; } 

Be aware though, support for Object.keys() doesn't seem cross-browser just yet.