KTP Checker

The KTP Checker is a developer-focused validation tool designed to parse and validate Indonesian KTP (NIK) numbers in data pipelines and form validations. It accepts a 16-digit string, ensures proper numeric length, and does not query external databases. The output includes derived metadata such as region code, birth date, and inferred gender, enabling data quality checks, compliance reviews, and onboarding workflows. It is intended for engineers, data stewards, and compliance teams who need deterministic format verification and metadata extraction without relying on live identity verification.\n\nCore logic and features: Required input nik (16-digit string). Outputs: valid_format, region_code, birth_date, and gender, plus error_message. The algorithm parses: region (first 6 digits), birth date (digits 7-12 as YYMMDD), and gender from digits 13-16. Century assumption uses a simple heuristic: YY >= 50 implies 19YY, else 20YY. The tool can optionally validate region_code against known province codes for stricter checks. It handles offline operation and predictable behavior across languages and locales.\n\nUnique value and use cases: By offering offline parsing and consistent metadata extraction, the tool reduces manual data cleaning, improves onboarding accuracy, and supports audit trails in CRM and ERP integrations. It is distinguished by deterministic date inference, explicit outputs, and a clear boundary around identity verification (no DB lookups). Use cases include batch validation of records, real-time form validation, and data quality dashboards that track NIK format integrity and derived fields.