Resolving the Dynamic Server Usage Error in Next.js Prerendering

Learn how to fix the `Dynamic server usage: Page couldn't be rendered statically` error in Next.js while building your application. Follow our step-by-step solution to get your app back on track!
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This video is based on the question https://stackoverflow.com/q/77511955/ asked by the user 'Johan' ( https://stackoverflow.com/u/17978333/ ) and on the answer https://stackoverflow.com/a/77512395/ provided by the user 'aymen gharbi' ( https://stackoverflow.com/u/22947260/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The Dynamic Server Usage Error in Next.js

Building applications with Next.js can be incredibly rewarding, but sometimes developers face unexpected challenges that can derail their progress. One common issue is the Dynamic server usage: Page couldn't be rendered statically error. If you've encountered an error similar to this when attempting to build your Next.js app, you are not alone.

This particular error typically arises when your code attempts to use dynamic server functionalities in a context expected to be static. In this guide, we’ll explore why this error occurs and provide a detailed solution.

Understanding the Problem

When you build an app using Next.js, certain pages are expected to be rendered statically. However, if these pages use dynamic functions, such as getServerSession from the next-auth library, Next.js will throw an error during the prerendering process.

Here’s a snippet of the error message you might see:

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

This indicates that your application is trying to perform operations that are not compatible with static rendering.

The Code Causing the Error

In this case, the issue is tied to the api/user/route handling in your application. You have code that manages user sessions and fetches data from the database, which inherently requires server-side functionality.

Here’s how that portion of the code looks:

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

The Solution: Making Your Page Dynamic

To resolve the error, we need to inform Next.js that this particular route requires dynamic server usage. We can do this by modifying the code at the top of your route file.

Step-by-Step Guide

Open Your Route File: Navigate to the api/user/route.js where the error originates.

Add Dynamic Export: At the very top of the file, add the following line:

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

This line tells Next.js that the page contains server-side rendered content and therefore cannot be statically optimized.

Review the Updated Code: Your complete code should now look like this:

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

Rebuild Your Application: Save your changes and try rebuilding your application. This time, the error should no longer appear.

Conclusion

Errors like the Dynamic server usage issue encountered while building Next.js applications can be frustrating, but they are certainly solvable with the right approach. By adding the export const dynamic = "force-dynamic"; line to your API route file, you instruct Next.js to handle your server functions appropriately.

When facing issues with your Next.js app, always remember to check if the page rendering expectations align with the functionalities you’re trying to implement. Happy coding!

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Build Next.js : Error occurred prerendering page /api/user, javascript, next.js