To troubleshoot file system access issues, check the file paths, permissions, and ensure your application has the required access rights to read or write files.

File system access issues in a Node.js application can lead to runtime errors and disrupt functionality, making troubleshooting essential. Start by verifying the file paths used in your application; ensure they are correct and that any relative paths are accurately resolving to the intended locations. Use Node.js's path module to help construct file paths safely and consistently across different environments. Next, check the file and directory permissions to confirm that your application has the required rights to read or write files. On Unix-based systems, use commands like ls -l to review permissions and adjust them if necessary with chmod. If your application runs in a containerized environment, ensure that the container has the correct access to the host file system. Additionally, review your application’s error handling; log detailed error messages when file access fails to capture the specific issues occurring. By systematically checking these areas, you can effectively troubleshoot and resolve file system access issues in your Node.js application.