Solving the TypeError: data.comments is undefined in ReactJS When Fetching API Data

---

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---

Understanding the Problem

In our scenario, the developer is attempting to fetch item data along with its associated comments through the following routes:

What Triggers the Error?

Initial State Setup: The initial state for itemComments is set as an empty array:

[[See Video to Reveal this Text or Code Snippet]]

At first, there is nothing for the component to reference, leading to the undefined error.

A Subtle Solution: Properly Initialize State

The solution to this problem is simple: Modify the initial state of itemComments to ensure it always has a comments property. Here’s how you do it:

Update the Initial State

Change the state declaration from:

[[See Video to Reveal this Text or Code Snippet]]

to:

[[See Video to Reveal this Text or Code Snippet]]

By initializing itemComments to an object with a comments property as an empty array, you eliminate the risk of encountering undefined within your rendering logic.

Adjust the Rendering Logic

Here’s how you can revise the rendering snippet:

[[See Video to Reveal this Text or Code Snippet]]

Putting It All Together

With these adjustments combined, you should not run into the TypeError during your component's lifecycle. Here’s a condensed view of the key points:

Initialize State Correctly:

Use const [itemComments, setItemComments] = useState({ comments: [] });

Check Rendering Logically:

Conclusion

If you found this solution helpful, be sure to check back for more tips and tricks on troubleshooting React and API interactions.