Foundation · 2 min
What you need to know
Why do address formats differ by country?
Postal systems evolved differently, using different ordering, administrative areas, building identifiers, locality rules, and postal codes. One country’s form is not a global standard.
How should international checkout address forms work?
Select country early, display only relevant fields, permit local characters and flexible line lengths, and format the final label for the destination and carrier.
Should every country use the same address fields?
No. Labels required fields and validation should follow the selected country; forcing state or postal code everywhere creates false data and rejection.
What should happen when a country doesn’t use postal codes?
Remove the requirement for supported countries that do not use them, while preserving a carrier-specific exception only when truly necessary and clearly explained.
How should states, provinces, and regions be handled?
Use country-specific administrative-area lists where reliable, allow valid free text when appropriate, and store stable codes separately from localized display names.
How should international addresses be validated?
Validate with country-aware rules and delivery data, offering suggestions without silently replacing the customer’s address. Let a legitimate address proceed through a controlled exception when possible.
Why are valid international addresses being rejected?
The validator may assume the wrong country format, require nonexistent fields, reject local characters, use stale locality data, or confuse billing and delivery constraints.
A quick store check
Test address entry for three structurally different countries and inspect the exact carrier label produced.
Foundation · 2 min
Frequently asked questions
Should validation silently rewrite an address?
No. Show the suggestion and let the customer confirm material changes.
Can address line two be required globally?
No. Address structure and apartment conventions vary.