How do i check my Json - json

Question

I'm using Titanium Appcelerator to develop an Android application..I getting an error while using 'ACS JSON' .. I trying to use posts query, But i getting different kinds of array ..i need to check is whether the string is available or not before access..
For Example:
"response": {
"posts": [
{
"id": "52e7800340b4b0aa134",
"title": "test",
"created_at": "2014-01-28T10:01:39+0000",
"updated_at": "2014-01-30T11:59:54+0000",
"content": "#hi all",
"reviews_count": 3,
"ratings_count": 3,
"ratings_average": 3.67,
"ratings_summary": {
"5": 1,
"3": 2
},
"user": {
"id": "52e5e87f08a3e70b3309c3e3",
"first_name": "aa",
"last_name": "ss",
"created_at": "2014-01-27T05:02:55+0000",
"updated_at": "2014-01-30T11:58:49+0000",
"external_accounts": [
],
"confirmed_at": "2014-01-27T05:02:55+0000",
"username": "ss",
"role": "a",
"admin": "false"
},
"custom_fields": {
"postedby": "aa",
}
},
{
"id": "52e7908a3e70b3d0a9614",
"title": "bb",
"tags": [
"sdf",
],
"created_at": "2014-01-28T11:46:00+0000",
"updated_at": "2014-01-30T11:09:17+0000",
"content": "#hi# #kWh v #sdf",
"user": {
"id": "52e5e87f08a3e70b3309c3e3",
"first_name": "bb",
"last_name": "bbc",
"created_at": "2014-01-27T05:02:55+0000",
"updated_at": "2014-01-30T11:58:49+0000",
"external_accounts": [
],
"confirmed_at": "2014-01-27T05:02:55+0000",
"username": "b",
"role": "b",
"admin": "false"
},
"custom_fields": {
"postedby": "b"
}
},
See I getting *ratings_count* in my first post..while trying access this inside for loop i getting error..
Now i need to check is whether the string is available or not before access..!

Answer 1

In titanium you can check anything whether it exist or not by using if statment.You can do this
if(ratingcount){
//Do here whatever you want to do
}
Thanks

Answer 2

Try:
for (var i in response.posts) {
post = response.posts[i];
if (post.ratings_count) {
/* Do operations for post with ratings */
} else {
/* Do operations for post without ratings */
}
}
This is pretty basic operation in JavaScript, so before you dive deeper into Titanium it's good to catch up with plain JS before.