File system in nodeJS

Introduction

The fs module enables interacting with the file system in a way modelled on standard POSIX functions
To use the promise-based APIs
To use the callback and sync APIs
All file system operations have synchronous, callback, and promise-based forms

// Using ESM Module syntax:
import * as fs from 'fs/promises';
// Using ESM Module syntax:
import * as fs from 'fs';

Write to file

Example to write some content to file

import { writeFile } from 'fs/promises';

try {
    const data = new Uint8Array(Buffer.from('Hello Node.js'));
    writeFile('message.txt', data);
} catch (err) {
    console.error(err);
}
// Writes Hello Node.js to file message.txt