Address Localization Concepts

Address localization means formatting addresses according to local conventions for display.

Why Localize?

The same address should display differently depending on context:

For US audience:

1123 Main Street
2New York, NY 10001
3USA

For German audience:

1123 Main Street
2New York, NY 10001
3VEREINIGTE STAATEN

Display Conventions by Country

US Format

1STREET
2CITY, STATE ZIP
3[COUNTRY]

UK Format

1STREET
2CITY
3POSTCODE
4[COUNTRY]

German Format

1STREET NUMBER
2PLZ CITY
3[COUNTRY]

Japanese Format

1〒POSTAL-CODE
2PREFECTURE-CITY-DISTRICT
3STREET/BLOCK
4[BUILDING]

Line Breaks

Different countries use different line break conventions:

Implementation

javascript
1class AddressFormatter {
2  static FORMATS = {
3    US: '{street}\n{city}, {state} {zip}',
4    GB: '{street}\n{city}\n{postcode}',
5    DE: '{street}\n{zip} {city}',
6    JP: '〒{zip}\n{state}{city}\n{street}'
7  };
8
9  format(address, country) {
10    const template = AddressFormatter.FORMATS[country] || '{street}\n{city}';
11    return template.replace(/{(\w+)}/g, (_, key) => address[key] || '');
12  }
13}

Best Practices

1. Detect user's locale - Format for their expectations
2. Use templates - Define format per country
3. Handle missing fields - Gracefully skip undefined
4. Include country for international - Always for cross-border