This technical feature enables your application to accept, parse, and validate both 5-digit US ZIP codes and 6-digit international postal codes (like China's 015107 ) without failing. 1. User Interface (UI) Behavior : Create a single "Postal / ZIP Code" text field.
🛠️ Feature Specification: Dynamic Global Postal Code Validator 015107 zip
CREATE TABLE user_addresses ( id SERIAL PRIMARY KEY, street_address VARCHAR(255), city VARCHAR(100), state_province VARCHAR(100), -- Always use VARCHAR for postal codes to keep leading zeros postal_code VARCHAR(12) NOT NULL, country_code CHAR(2) NOT NULL ); Use code with caution. Copied to clipboard 4. API Response Model (JSON) This technical feature enables your application to accept,
as it contains six digits, whereas US ZIP codes strictly use five digits (or nine digits for ZIP+4). However, 015107 serves as a valid postal code for Bayannur, Inner Mongolia, China . However, 015107 serves as a valid postal code
: Use the entered code to instantly suggest the corresponding city and country. 2. Regex Validation Rules
To build a software feature around this specific data point, it is best to treat it as a problem.
Store postal codes as strings rather than integers to prevent the system from dropping critical leading zeros (such as the 0 in 015107 ).