Core ModulesLesson 23Free preview

File System (fs)

This lesson is part of Node.js · All levels

Summary

The fs module provides an API for reading, writing, modifying, and deleting files and folders on disk. There are two styles available: asynchronous that does not block the event loop and synchronous that returns the immediate results. For server applications, the asynchronous or Promise-based (fs/promises) method is highly recommended. (Node.js)

Key points

Use fs.readFile and fs.writeFile for non-blocking file operations
The method of sync (readFileSync) blocks the event loop, only for one run of the script
Fs/promises with await more neatly for modern asynchronous grooves
Always handle errors like files not found (ENOENT)

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