Error: Module not found: Error: Can't resolve 'fs' in

'fs' is a built-in Node.js module for file system operations. This error typically occurs when trying to use 'fs' in a non-Node.js environment, such as a browser, where 'fs' is not available.

The root cause is that 'fs' is part of Node.js and is not included in browser environments. If you're trying to run code that uses 'fs' in a browser context, it will fail because the browser does not have access to the file system.

To fix this, ensure that your code is running in a Node.js environment. If you need to run similar functionality in the browser, consider using browser-compatible libraries or APIs that provide file handling capabilities.