Chapter Index

File System

5 topics in this chapter

5Topics
01
Topic

File Descriptors & Handles

How file descriptors and FileHandle objects map to OS file state, open flags, close behavior, libuv work, and EMFILE failures.

nodejsfile-systemfile-descriptorsfsposix
23 min read
02
Topic

File I/O

How Node.js reads and writes files through whole-file helpers, streams, low-level read/write calls, append mode, and durable flushes.

nodejsfile-systemfsreadFilewriteFile
31 min read
03
Topic

fs.promises & FileHandle

How fs.promises and FileHandle work in Node.js, including async file operations, descriptor ownership, stream lifecycles, cleanup, and controlled concurrency.

nodejsfile-systemfs-promisesFileHandleasync-await
29 min read
04
Topic

fs.watch & Atomic Writes

How fs.watch, fs.watchFile, OS watcher backends, and atomic replacement patterns interact in real file workflows.

nodejsfile-systemfs-watchatomic-writesinotify
45 min read
05
Topic

Permissions & Metadata

How Node.js exposes file permissions, ownership, stat metadata, symlinks, inodes, sparse files, special paths, and filesystem edge cases.

nodejsfile-systempermissionsstatsymlinksmetadata
36 min read

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