Swedish Personal Number or Swedish Social Security Number Validation and Generation

A modern JavaScript library for validating and generating Swedish Personal Numbers (Social Security Numbers).

Features

• 🔍 Validate Swedish Personal Numbers
• 🎲 Generate valid random SSNs
• 👥 Generate SSNs with specific gender
• 📅 Support for both YY and YYYY date formats
• 0️⃣ Zero dependencies
• 🌐 Works in Node.js and browsers
• 📦 Modern ES modules and UMD builds

Installation

# Using npm
npm install swedish-ssn-tool

# Using yarn
yarn add swedish-ssn-tool

# Using pnpm
pnpm add swedish-ssn-tool

Usage

ES Modules (Recommended)

import SwedishSSN from 'swedish-ssn-tool';

// Validate an SSN
const isValid = SwedishSSN.validate('870430-2713');
console.log(isValid); // true

// Generate a random SSN
const randomSSN = SwedishSSN.generateRandomSSN();
console.log(randomSSN); // e.g., '901224-1234'

// Generate SSN for specific gender and date
const femaleSSN = SwedishSSN.generateSSNWithParameters(
  new Date('1990-12-24'), 
  'female'
);

Browser (UMD)

<script src="https://unpkg.com/swedish-ssn-tool/dist/swedish-ssn.min.js"></script>
<script>
  // Library is available as global SwedishSSN
  const isValid = SwedishSSN.validate('20870430-2713');
  console.log(isValid); // true
</script>

API Reference

validate(ssn: string): boolean

Validates a Swedish SSN. Returns true if valid, false otherwise.

SwedishSSN.validate('870430-2713');  // true
SwedishSSN.validate('20870430-2713'); // true (YYYY format)
SwedishSSN.validate('invalid');       // false

generateRandomSSN(): string

Generates a random valid Swedish SSN.

const ssn = SwedishSSN.generateRandomSSN();
// Returns formatted SSN like '870430-2713'

generateSSNWithParameters(birthdate: Date, gender?: 'male' | 'female'): string

Generates a valid SSN with specified parameters.

// Generate female SSN
const femaleSSN = SwedishSSN.generateSSNWithParameters(
  new Date('1987-04-30'), 
  'female'
);

// Generate male SSN
const maleSSN = SwedishSSN.generateSSNWithParameters(
  new Date('1987-04-30'), 
  'male'
);

// Generate random gender SSN
const randomSSN = SwedishSSN.generateSSNWithParameters(
  new Date('1987-04-30')
);

Development

# Install dependencies
npm install

# Run tests
npm test

# Build distribution files
npm run build

# Lint code
npm run lint

# Format code
npm run format

Format Specification

Swedish Personal Numbers follow this format:

• YYMMDD-XXXX (10 digits)
• YYYYMMDD-XXXX (12 digits)

Where:

• YY/YYYY = Year
• MM = Month
• DD = Day
• XXXX = Four digit sequence where last digit is a checksum
• The second to last digit indicates gender (even for female, odd for male)

Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

GPL License

Author

teaddict - GitHub

Changelog

1.0.3

• Update package and simplify build process

1.0.2

• Modernized build system with Rollup
• Added ESM module support
• Improved testing setup
• Added TypeScript types
• Enhanced documentation

1.0.1

• Bug fixes and improvements

1.0.0

• Initial release