Struggling to Parse a Custom JSON Format with Nested Arrays in JavaScript - Getting Unexpected Undefined Values
I'm sure I'm missing something obvious here, but I'm working on parsing a custom JSON structure that has nested arrays, and I'm running into issues where some expected values are undefined. Here's an example of the JSON structure I'm dealing with: ```json { "users": [ { "id": 1, "name": "Alice", "messages": [ { "content": "Hello World", "timestamp": "2023-10-01T10:00:00Z" }, { "content": "How are you?", "timestamp": "2023-10-02T10:05:00Z" } ] }, { "id": 2, "name": "Bob", "messages": [ { "content": "Hey there!", "timestamp": "2023-10-01T11:00:00Z" } ] } ] } ``` I’ve written the following code to parse the messages for each user: ```javascript const jsonData = /* JSON data as shown above */; jsonData.users.forEach(user => { user.messages.forEach(message => { console.log(`User: ${user.name}, Message: ${message.content}`); }); }); ``` However, when I run this code, I occasionally get an behavior that says `want to read properties of undefined (reading 'content')`. I suspect it might have something to do with the messages array being undefined for some users, but I’m not sure how to handle it properly. I've also tried adding checks to make sure that `messages` is an array before iterating over it: ```javascript if (Array.isArray(user.messages)) { user.messages.forEach(message => { ... }); } ``` Even with that check, I'm still experiencing issues. I've confirmed that all users have a `messages` key, but I need to figure out where the undefined values are coming from. I'm using Node.js v16.13.0, and any insights into handling this scenario would be greatly appreciated! I'm working on a web app that needs to handle this. What am I doing wrong?