City → Timezone Search Index

Builds a small, fast JSON index for client-side city-to-timezone search.

• Source: GeoNames cities15000.txt
• Includes major cities + all country capitals
• Joins country names
• Normalizes names for easy search
• Uses IANA timezones

Output shape (example):

{
  "id": "uuid",
  "city": "São Paulo",
  "country": "Brazil",
  "timezone": "America/Sao_Paulo",
  "search": "brazil sao paulo são paulo"
}

Output file:

cities100000_with_country.json