devkits-chmod-calculator

@devkits/chmod-calculator

Calculate Unix file permissions between numeric (755) and symbolic (rwxr-xr-x) notation. Essential tool for developers working with Linux/Unix systems.

💰 Support DevKits

Love these tools? Support development via Open Collective

• $5/mo - Supporter (priority support)
• $9/mo - Pro (early access to new tools)
• $29 - Lifetime (all current + future Pro features)

💎 Upgrade to DevKits Pro

Get access to 20+ premium tools including SQL to Code, Data Faker, JWT Generator, and more — all for $9 one-time.

→ Unlock DevKits Pro

💡 Pay with Crypto: BTC, ETH, USDT (TRC-20), SOL accepted. View crypto addresses

🧰 DevKits Pro Tools

This package is part of DevKits — 82+ free developer tools. The online Chmod Calculator includes visual permission builder and preset recommendations.

→ Try Visual Permission Builder

Installation

npm install @devkits/chmod-calculator

Usage

const { fromNumeric, toSymbolic, parsePermissions, toCommand, PRESETS } = require('@devkits/chmod-calculator');

// Convert numeric to symbolic
fromNumeric('755');
// 'rwxr-xr-x'

fromNumeric('644');
// 'rw-r--r--'

// Convert symbolic to numeric
toSymbolic('rwxr-xr-x');
// '755'

// Get detailed permission breakdown
parsePermissions('755');
// {
//   numeric: '755',
//   symbolic: 'rwxr-xr-x',
//   owner: { value: 7, symbolic: 'rwx', read: true, write: true, execute: true },
//   group: { value: 5, symbolic: 'r-x', read: true, write: false, execute: true },
//   other: { value: 5, symbolic: 'r-x', read: true, write: false, execute: true }
// }

// Generate chmod command
toCommand('755', 'myscript.sh');
// 'chmod 755 myscript.sh'

// Access common presets
console.log(PRESETS['755']);
// 'Owner full, others read+execute (rwxr-xr-x)'

API

fromNumeric(numeric)

Converts numeric chmod (e.g., '755') to symbolic notation (e.g., 'rwxr-xr-x').

toSymbolic(symbolic)

Converts symbolic notation to numeric chmod.

numericToSymbolic(num)

Converts a single permission digit (0-7) to symbolic (e.g., 5 → 'r-x').

symbolicToNumeric(symbolic)

Converts a single symbolic triplet to numeric (e.g., 'r-x' → 5).

toCommand(numeric, filename)

Generates a chmod command string.

parsePermissions(numeric)

Returns detailed breakdown of permissions for owner, group, and others.

PRESETS

Object containing common permission presets with descriptions.

Common Permission Presets

Mode	Symbolic	Use Case
777	rwxrwxrwx	Everyone has full permissions (dangerous!)
755	rwxr-xr-x	Executable scripts, directories
700	rwx------	Private directories
644	rw-r--r--	Regular files, web content
600	rw-------	Private files, SSH keys
444	r--r--r--	Read-only files
400	r--------	Owner read-only

See Also

🔧 More DevKits Tools

Free Tools (82+):

Tool	Description
base64-tool	Base64 encode/decode
cron-parser	Cron expression parser
csv-json-converter	CSV ↔ JSON converter
diff-checker	Text comparison (LCS)
docker-compose-parser	Docker Compose parser

→ Browse All 82+ Free Tools

💎 DevKits Pro — $9 One-Time

Unlock 20+ premium tools with a single payment:

• SQL to Code
• Data Faker
• JWT Generator
• Crypto Hash
• URL Parser
• Color Converter
• Timestamp Tool
• Slug Generator

→ Unlock DevKits Pro for $9

💡 Pay with Crypto: BTC, ETH, USDT (TRC-20), SOL accepted

🚀 Other Products from Us

Product	Description
Invoicely	Free invoice generator for freelancers
SnapOG	Free OG image generator (20+ templates)

License

MIT