SSN Validator API — Validate Scandinavian Social Security Numbers
Validate SSN, personnummer (Norway), personnummer (Sweden), and CPR (Denmark) numbers. Country-specific format checks with modulus validation. Free API.
What is SSN Validation?
Social Security Number (SSN) validation checks the format and integrity of national identification numbers. The API supports Norwegian fødselsnummer/personnummer (11 digits with modulus 11 validation), Swedish personnummer (12 digits with date validation), and Danish CPR numbers (10 digits). Each country has specific validation rules beyond simple digit counting.
How to Use It
Call GET /api/v1/ssn-validator?ssn=12345678901&country=NO. Returns { valid: boolean, country: string, formatted: string, gender: string | null, birth_date: string | null, error: string | null }.
Try it live
Test this endpoint in the interactive console
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Frequently Asked Questions
Which countries are supported?
Norway (fødselsnummer/personnummer, 11 digits), Sweden (personnummer, 12 digits with YYYYMMDD-XXXX format), and Denmark (CPR, 10 digits).