What fs-extra does

fs-extra is a toolbox of extra file and folder operations for Node.js. It solves a common developer frustration: the built-in file system tools are missing some everyday tasks. Instead of installing separate libraries to copy folders, delete directories, or create nested folder structures, fs-extra bundles all of that into one place.

Think of it like this: Node.js gives you basic file operations out of the box, but fs-extra is like upgrading to a more complete toolkit. You can swap it in as a direct replacement for the standard file system library without changing how your code is structured.

How it works

The library adds convenience methods on top of what Node.js already offers. For common tasks like copying an entire directory with all its contents, deleting a folder recursively, or creating a nested folder path that doesn't exist yet, fs-extra provides simple functions. Most operations come in two flavors: asynchronous versions (which run in the background and call you back when done) and synchronous versions (which complete immediately but can block your code). The README also mentions it can read and write JSON files directly, walk through directory structures, and ensure that files or directories exist before doing something with them.

Who uses it and why

Any Node.js developer building command-line tools, build scripts, file management systems, or backend services would use this. For example, if you're writing a deployment script that needs to copy an entire project folder, delete old builds, create backup directories, or organize files—fs-extra saves you from piecing together multiple separate libraries. It's become so popular that the README notes it's one of the most depended-upon packages in the Node.js ecosystem.

The project emphasizes code quality and has extensive test coverage across different operating systems, including special handling for Windows permissions around symbolic links.