How can I troubleshoot a 'module not found' error when trying to use the 'fs' module in my Node.js project?

To troubleshoot this, first, ensure you have Node.js and npm (Node Package Manager) installed. Then, check if the `fs` module is installed globally using `npm install -g fs` (though it's usually built-in). If it's installed locally in your project, make sure the `fs` module is in your `node_modules` directory and that your project's `package.json` file correctly specifies its dependency. Also, verify that your `node_modules` directory is not corrupted. A simple `npm cache clean --force` followed by `npm install` can resolve dependency issues.