File System (fs)

Summary

Node's built-in module for reading, writing and manipulating files on disk — both synchronous and asynchronous (Promise-based) variants.

• 1Read and write a file using both `fs.promises` and the callback-based API.
• 2Practice watching a directory for changes with `fs.watch`.
• 3Learn why you should almost always prefer the async `fs` methods on a server.