Next.js 14 apps: 5 common errors that hinder performance

Avoid these 5 common mistakes in your Next.js 14 apps:

  1. Not specifying the sizes prop in the image component can lead to downloading a bigger or smaller image, impacting performance.
  2. Using usedFormStatus within the same element as the button component can cause loading errors.
  3. Calling redirect within a catch block can cause a next redirect error.
  4. Forgetting to purge your data cache after refetching can result in stale data.
  5. Making the topmost page a component can turn all children into client components, defeating the purpose of client-server architecture. Check out the server actions video and Next.js crash course for more info. πŸš€

Next.js is an amazing framework for building fast and scalable web applications. However, even experienced developers can make common mistakes that slow down their Next.js 14 apps. In this article, we’ll cover these common mistakes and provide solutions to avoid them in the future.

Image Component Mistake: Not Specifying the Sizes Prop πŸ“·

The image component in Next.js is a special component that extends the image element from the browser. Using the image component can provide many benefits, but one common mistake is not specifying the sizes prop. By adding the sizes prop, Next.js can serve the proper size of the image based on the viewport, dramatically improving performance. If the sizes prop is not specified, Next.js will default to 100 viewport, leading to downloading a larger image than necessary. To avoid this mistake, make sure to specify the sizes prop in the image component.

Server Action Mistake: Not Showing Loading State πŸ”„

When performing server actions, such as uploading data, it’s important to show a loading state to the user. One common mistake is not showing the loading state, leaving the user unsure if the action is in progress. To avoid this mistake, use a specific hook that allows you to hook into the request and get the state of the request itself. By using this hook, you can easily show the loading state to the user and provide a better user experience.

Server Action Mistake: Calling Redirect Inside Catch Block 🚫

When using server actions, it’s common to redirect the user to a success page after completing an action. However, one common mistake is calling the redirect function inside the catch block. This causes an error to be thrown, resulting in unexpected behavior. To avoid this mistake, make sure to call the redirect function outside the catch block.

Caching Mistake: Not Purging the Cache After Updating Data πŸ—‘οΈ

Caching is an essential part of Next.js, but it can also be confusing. One common mistake is not purging the cache after updating data. This can lead to stale data being kept in the cache, resulting in unexpected behavior. To avoid this mistake, make sure to purge the cache after updating data to ensure that the latest data is being served.

Component Mistake: Making Topmost Page a Component πŸ“

When adding client functionality to a page, it’s common to make the topmost page a component. However, this can cause all of the children underneath to become client components, defeating the purpose of the client-server architecture. To avoid this mistake, always extract client functionality into its own component, keeping the topmost page as a server component.

Key Takeaways 🧠

  • Always specify the sizes prop in the image component to improve performance.
  • Show a loading state when performing server actions to provide a better user experience.
  • Call the redirect function outside the catch block when using server actions.
  • Purge the cache after updating data to ensure that the latest data is being served.
  • Extract client functionality into its own component to avoid making the topmost page a client component.

FAQ ❓

What is Next.js?

Next.js is a framework for building fast and scalable web applications.

What are some common mistakes when using Next.js?

Some common mistakes include not specifying the sizes prop in the image component, not showing a loading state when performing server actions, calling the redirect function inside the catch block, not purging the cache after updating data, and making the topmost page a client component.

How can I avoid these mistakes?

To avoid these mistakes, make sure to specify the sizes prop in the image component, show a loading state when performing server actions, call the redirect function outside the catch block, purge the cache after updating data, and extract client functionality into its own component.

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