015107 | Zip
: Do not force a hard 5-digit limit or automatic hyphenation until the user's country is selected.
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) 015107 zip
To build a software feature around this specific data point, it is best to treat it as a problem. : Do not force a hard 5-digit limit
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. API Response Model (JSON) To build a software
Store postal codes as strings rather than integers to prevent the system from dropping critical leading zeros (such as the 0 in 015107 ).
Apply these conditional regular expression constraints depending on the detected or selected country: Code Example Regex Pattern 015107 ^[0-9]{6}$ United States 90210 ^[0-9]{5}$ United States (ZIP+4) 90210-4321 10 Characters ^[0-9]{5}-[0-9]{4}$ 3. Database Schema (PostgreSQL Example)
{ "input_code": "015107", "is_valid": true, "country": "China", "country_iso": "CN", "region": "Inner Mongolia", "city": "Bayannur" } Use code with caution. Copied to clipboard js backend API endpoint ?