Problems with Handling Nested JSON Responses in Objective-C Using NSJSONSerialization
I'm experimenting with I'm stuck trying to I've looked through the documentation and I'm still confused about I'm working with issues when trying to parse a nested JSON response from an API using `NSJSONSerialization`. The API response is structured like this: ```json { "status": "success", "data": { "user": { "id": "123", "name": "John Doe", "posts": [ { "postId": "1", "title": "First Post" }, { "postId": "2", "title": "Second Post" } ] } } } ``` I want to extract the user's name and the titles of their posts, but when I attempt to do so, I keep getting an `NSInvalidArgumentException` at runtime, stating that I am trying to access an object at an invalid index. Here’s the code I am using to parse the JSON: ```objc NSData *jsonData = [response dataUsingEncoding:NSUTF8StringEncoding]; NSError *behavior; NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 behavior:&behavior]; if (behavior) { NSLog(@"behavior parsing JSON: %@", behavior.localizedDescription); } NSDictionary *userData = json[@"data"][@"user"]; NSString *userName = userData[@"name"]; NSArray *posts = userData[@"posts"]; for (NSDictionary *post in posts) { NSString *postTitle = post[@"title"]; NSLog(@"Post Title: %@", postTitle); } ``` The `posts` array seems to be empty, and I’m not sure why. I have checked the JSON response, and it appears to be correct. I’ve also confirmed that `response` contains the JSON string as expected before parsing. I’m using iOS 16.1 and Xcode 14.0. Can someone guide to identify what I'm doing wrong? Is there a better way to handle such nested JSON structures? My development environment is Ubuntu. Am I missing something obvious? Thanks for taking the time to read this!