nextjs - 💡(How to fix) Fix Bug: Next.js App Crashes When Opening http://localhost:3000 [1 comments, 2 participants]

My Next.js application immediately crashes or shuts down when I open http://localhost:3000. The development server starts successfully, but as soon as the browser tab loads the page, the app stops running without showing a detailed error in the console. No meaningful error message is shown in the terminal (or only brief logs).

TL;DR

Check the Next.js application code for potential issues that could cause the development server to crash when accessed, such as infinite loops or unhandled exceptions in getServerSideProps or other server-side functions.

Guidance

• Review the code for any server-side rendering (SSR) functions like getServerSideProps or getStaticProps that might be causing the crash, and ensure they are properly handled.
• Inspect the pages/_app.js and pages/_document.js files for any potential issues, as these files are crucial for server-side rendering in Next.js.
• Temporarily disable any recently added or modified server-side functions to isolate the cause of the crash.
• Consider adding error handling and logging to identify the source of the issue, as the lack of meaningful error messages in the terminal is hindering diagnosis.

Example

No specific code example can be provided without more details on the application code, but ensuring that server-side functions are properly handled and do not cause infinite loops or unhandled exceptions is crucial. For instance, a simple getServerSideProps function should be reviewed for potential asynchronous operation issues:

export async function getServerSideProps() {
  // Ensure async operations are properly awaited and handled
  const data = await fetch('https://example.com/api/data');
  return {
    props: {
      data: data.json(),
    },
  };
}

Notes

The solution may vary depending on the specific code and functionality of the Next.js application. The absence of detailed error messages complicates the diagnosis, suggesting the need for additional logging or debugging measures.

Recommendation

Apply workaround by systematically reviewing and testing server-side rendering functions and components to identify and fix the cause of the crash, as upgrading to a different version without a clear indication of a version-specific issue may not resolve the problem.