postal-code-checker is a comprehensive JavaScript/TypeScript package for validating postal codes across multiple countries. It provides an easy-to-use API for country selection and postal code validation, making it ideal for forms and address validation in web applications.
Validate Nigerian postcodes in Rust, Python, JavaScript, Java, PostgreSQL, DuckDB, and Polars, with MCP servers for AI agents. Covers Nigeria's NIPOST digital postcode (NDAPS): offline validation, lookup, and reverse geocoding.