Read and write files with fs.
✍️ 2 exercises in this lessonThe fs module works with files. Prefer the promise-based API:
import { readFile, writeFile, appendFile, unlink } from "node:fs/promises";await writeFile("notes.txt", "text")await readFile("notes.txt", "utf8")mkdir, readdir, stat, rmThe path module builds paths that work on every OS: path.join(dir, "file.txt").
Mastering Node.js File System helps you write clean and reliable Node.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
import { writeFile, appendFile, readFile, unlink } from "node:fs/promises";
import path from "node:path";
const file = path.join(process.cwd(), "notes.txt");
await writeFile(file, "Learn Node\n");
await appendFile(file, "Build APIs\n");
const text = await readFile(file, "utf8");
console.log(text.trim().split("\n"));
await unlink(file);[ 'Learn Node', 'Build APIs' ]
Check what you learned in “Node.js File System”.
Read a file as text with the promise API.
const text = await readFile("notes.txt", "");
Which module builds file paths that work on every OS?
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