Скачать или смотреть Resolving the Uncaught SyntaxError: Unexpected string in Next.js 13 with Pagination Component

Discover how to fix the `Uncaught SyntaxError: Unexpected string` error in Next.js 13 when using a Pagination component. Learn effective solutions and best practices!
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Understanding and Fixing the Uncaught SyntaxError: Unexpected string Error in Next.js 13

If you are developing applications using Next.js 13, you may encounter a frustrating error during the build process:

Uncaught SyntaxError: Unexpected string.

This error typically pops up when there’s an issue with your JavaScript code, and in this post, we will explore a specific case involving this error that many developers face, particularly when dealing with paginated data on Static Site Generation (SSG) pages.

The Problem

In a typical scenario, you might have an SSG page that generates product listings or other paginated data. Below is a sample code snippet that outlines a page structure where this error could occur:

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

However, when running npm run build, you may encounter the Uncaught SyntaxError: Unexpected string error. Interestingly, this error does not occur during development mode.

Cause of the Error

Upon further investigation, it's noted that the error resolves when the <Pagination /> component is commented out.

The Pagination component relies on the useSearchParams hook from Next.js, which seems to cause issues in certain versions. Here's the critical line in the Pagination component:

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

This hook is used to retrieve URL query parameters dynamically. Although it works in development mode, it can lead to build-time issues, especially in earlier releases of Next.js.

Solution

After examining the situation, the issue was resolved by upgrading the Next.js version from 13.0.2 to 13.0.4. This suggests that the useSearchParams hook was unstable in the previous version.

Steps to Resolve the Issue

Upgrade Next.js:
Ensure that you update to the latest stable version of Next.js. Use the following command:

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

Check Your Dependencies:
Regularly check for updates in your project’s dependencies. Sometimes a release can solve bugs that affect development and production builds.

Fallback to Vanilla JavaScript:
If upgrading isn't an option or doesn’t resolve the issue, consider using fallback methods:

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

While this method isn't as integrated as the hook, it ensures a stable string representation of query parameters.

Test Thoroughly:
After implementing changes, make sure to test both the development and production builds (npm run build) to ensure that no new errors arise.

Conclusion

The Uncaught SyntaxError: Unexpected string error in Next.js can be daunting, but understanding where the issue lies is key to fixing it. If encountering issues with the useSearchParams hook:

Upgrade Next.js to eliminate the problem.

Consider using fallback methods if necessary.

With these steps, you should be able to build your application without interruptions and ensure a smooth user experience.

Stay updated, keep checking your dependencies, and happy coding!