REST API

Japan Data API

Comprehensive, structured data about Japan

Access regions, prefectures, cities, holidays, and more through a simple REST API. Built for developers who need reliable Japan data.

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curl -X GET "https://api.japandata.io/v1/prefectures" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "success": true,
  "data": [
    { "id": 1, "name": "Hokkaido", "name_ja": "北海道", "region_id": 1 },
    { "id": 2, "name": "Aomori", "name_ja": "青森県", "region_id": 2 },
    ...
  ]
}

Everything you need

Reliable Japan data at your fingertips

Regions & Prefectures

Complete data on all 8 regions and 47 prefectures of Japan, including names in multiple languages.

Cities & Municipalities

Detailed information on thousands of cities, towns, and villages across Japan.

Public Holidays

Accurate Japanese public holiday data, updated annually with proper date calculations.

RESTful API

Clean, well-documented REST API with JSON responses. Easy to integrate into any application.

8
Regions
47
Prefectures
1,700+
Cities
99.9%
Uptime

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Join thousands of developers using Japan Data API to build amazing applications.

  • Free tier with 1,000 requests/month
  • No credit card required
  • Get started in minutes
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