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Node.js

Node.js File System Module

Node.js interacts directly with your computer's files.

Read Time

5 min read

Difficulty

Beginner

Last Updated

Jun 15, 2026

Version

v1.0.0

Introduction

The Node.js File System module lets your JavaScript code read, create, update, and delete files on your actual computer. The browser cannot do this for security reasons, making Node.js incredibly powerful.

Example

1/* this reads a file */
2var fs = require('fs');
3
4fs.readFile('demofile.txt', 'utf8', function(err, data) {
5  if (err) throw err;
6  console.log(data);
7});

Key Points

Import the module using `require('fs')`.
The `readFile()` method reads file contents.
The `writeFile()` method creates new files.
The `unlink()` method deletes existing files.

Up Next

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Go to Node HTTP Module ❯