ISO 3166-1 Alpha-2 Codes: A Developer Overview
Learn what ISO 3166-1 alpha-2 codes represent, how they relate to other parts of ISO 3166, and where they are used.
October 6, 2026 2 min
Blog
Guides, explainers and references on addresses, postal codes and country data for developers.
Postal Code Validation API: A Practical Implementation Guide
Learn how to handle country-specific postal code formats in address forms, normalize user input, and use postal code lookup data.
October 3, 2026 3 min
Address Autocomplete API: Integrating Location Data in Forms
Learn how an address autocomplete API can help simplify form entry, and how administrative location data supports postal code lookup and validation.
October 2, 2026 3 min