Japan Address Guard

Catch Japanese address mistakes at checkout

No Reviews Yet

Free plan available

Japan Address Guard overview

Detect postal code, prefecture, and city mismatches
Warn customers without replacing your checkout fields
Choose warning-only, blocking, or off mode
Use Japan Post postal code data without storing addresses

Japan Address Guard helps Japanese online stores reduce failed deliveries caused by address mistakes. It checks the shipping address during checkout and warns customers when the postal code format looks wrong, the postal code does not match the selected prefecture, the city appears inconsistent, or the street address may be missing a block number. The app does not replace the address fields customers already fill in. It only adds validation messages at the right moment, so merchants can improve address quality without changing the checkout experience. You can keep warnings non-blocking, turn validation off, or use blocking mode for high-confidence issues on paid plans. Address data is processed only during validation. The app does not store shipping addresses and does not send them to third-party address APIs. If phone number checking is enabled on a paid plan, the phone number is also checked for format only and discarded on the spot; it is never stored.

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Pricing & plans

Basic plan

Free

100 free address checks every month

Postal code, prefecture & city checks

Never blocks your customers' checkout

Pro plan

13

/month

Unlimited address checks

Blocks high-confidence address issues

Fully customizable warning messages

Japanese phone number format checks

* Price is in USD.

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