ID Generators Guide: UUID, Test Numbers, and More

Generate valid test identifiers for development and testing. These tools create properly formatted IDs that pass validation.

UUID Generation

UUID Versions

Version	Description	Use Case
v1	Timestamp + MAC	Ordered IDs
v4	Random	Most common
v5	Namespace + Name	Deterministic
v7	Timestamp + Random	Sortable

JavaScript UUID v4

function generateUUID() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    const r = Math.random() * 16 | 0;
    const v = c === 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

// Using crypto API
function secureUUID() {
  return crypto.randomUUID();
}

Test Credit Card Numbers

Valid Test Numbers

Card	Number	Use
Visa	4111111111111111	Testing
Mastercard	5500000000000004	Testing
Amex	340000000000009	Testing
Discover	6011000000000004	Testing

Luhn Algorithm Check

function isValidLuhn(number) {
  const digits = number.replace(/D/g, '');
  let sum = 0;
  let isEven = false;

  for (let i = digits.length - 1; i >= 0; i--) {
    let digit = parseInt(digits[i], 10);

    if (isEven) {
      digit *= 2;
      if (digit > 9) digit -= 9;
    }

    sum += digit;
    isEven = !isEven;
  }

  return sum % 10 === 0;
}

Australian Business Numbers

ACN (Australian Company Number)

• 9 digits
• Weighted checksum algorithm

function generateACN() {
  const weights = [8, 7, 6, 5, 4, 3, 2, 1];
  let digits = [];

  for (let i = 0; i < 8; i++) {
    digits.push(Math.floor(Math.random() * 10));
  }

  let sum = 0;
  for (let i = 0; i < 8; i++) {
    sum += digits[i] * weights[i];
  }

  const checkDigit = (10 - (sum % 10)) % 10;
  digits.push(checkDigit);

  return digits.join('');
}

TFN (Tax File Number)

• 8 or 9 digits
• Weighted checksum

Medicare Number

• 10 or 11 digits
• Specific format with check digit

Important Notes

These generators create test data only:

• Do not use for fraud
• For development/testing only
• Real IDs have additional validation
• Test numbers may be flagged in production

Try Our ID Generators

• UUID Generator
• Credit Card Generator
• ACN Generator
• TFN Generator
• Medicare Generator
• Luhn Validator

Conclusion

Test ID generators help create realistic test data while following proper validation rules.