Resolving data undefined Issues with useSWR in Your Next.js Application

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The Problem: Data Undefined with useSWR

You may have set up your custom useSWR hook and your component correctly, but the data you expect to receive is coming back as undefined. For instance, consider the following implementation:

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

In this example, the useSocialMedia function is designed to fetch social media data from your API URL, but you're encountering an issue where data is always undefined.

Understanding the Cause

The root cause of this problem often lies within the fetcher function. In the code snippet provided:

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

What's missing here is the return statement that actually returns the response from the fetch call. Without it, the function completes without anything being returned, causing data to remain undefined.

The Solution: Fixing the Fetcher Function

To resolve this issue, you need to ensure that the fetcher function properly returns the fetched data. Here’s how you can modify the code:

Step 1: Modify the Fetcher Function

Update the fetcher function to include a return statement:

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

This small change ensures that the fetched data is returned and can be used by useSWR.

Step 2: Use the Hook in Your Component

Here’s an updated version of your component that utilizes the modified hook:

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

Step 3: Handling Different States

With these changes, your component should now handle different states effectively:

Loading State: Display a loading message while the data is being fetched.

Error Handling: Show an error message in case of a fetching failure.

Data Display: Render the received data once it’s available.

Conclusion

If you have any further questions or concerns about using useSWR, feel free to ask in the comments section below! Happy coding!