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