SSN Regex Javascript Validator

What is an SSN Regex?

In the U.S., a Social Security Number (SSN) is a 9-digit number formatted as XXX-XX-XXXX. Validating this format is crucial in applications where identity verification or data entry accuracy is required.

A regular expression (regex) helps ensure the format is correct before any sensitive operations are performed.

Common SSN Regex Pattern

/^\d{3}-\d{2}-\d{4}$/

What This Pattern Does:

• ^\d{3}: Start with exactly 3 digits

• -: A hyphen

• \d{2}: Followed by 2 digits

• -: Another hyphen

• \d{4}$: Ends with 4 digits

Valid SSN: 123-45-6789

Invalid SSN: 12-3456-789 or 123456789

How to Validate SSNs in JavaScript

Here’s a complete JavaScript code example:

function isValidSSN(ssn) {
  const ssnRegex = /^\d{3}-\d{2}-\d{4}$/;
  return ssnRegex.test(ssn);
}

// Example usage:
console.log(isValidSSN("123-45-6789")); // true
console.log(isValidSSN("123456789"));   // false

Where Can SSN Regex Be Used?

• User Onboarding: Ensure users enter valid SSNs in financial or HR applications.

• Database Integrity: Catch format errors before saving to your database.

• Form Validation: Block submissions that don’t follow the expected SSN structure.

  
  

Use our JavaScript Regex Tester to experiment with variations or build custom patterns.

Pro Tips

• Use .test() for fast checks in live form validation.

• Avoid storing SSNs as plain text. Use the Base64 Encoder to obfuscate values before transmission.

• For added security, combine regex validation with server-side checks and encryption.

• Regularly test your regex with mock data using our Random String Generator or Token Generator.

• Use the CSV to JSON Converter if you’re batch-validating SSNs from user-uploaded files.

Combine with These Tools

• JavaScript Regex Tester – Test any regex patterns live.

• Base64 Encoder – Encode sensitive strings before sending them over the web.

• Token Generator – Generate secure tokens with your regex rules.

• CSV to JSON Converter – Handle large imports of SSNs for validation and storage.