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Japan Court Auction (BIT) Scraper — Foreclosure Listings

REAL ESTATELEAD GENERATIONDEVELOPER TOOLS
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Japan Court Auction (BIT) Scraper — Foreclosure Listings

Scrapes Japan's official court auction database, BIT (不動産競売物件情報サイト), operated by the Supreme Court of Japan. Covers all 50 district courts across all 47 prefectures and extracts structured listing data including case numbers, addresses, bid prices, deadlines, and optional 3-point-set PDF links.

What BIT Is

BIT is the official public database for court-ordered foreclosure auctions in Japan. Properties are sold through a transparent bidding process administered by district courts. Listings typically appear at 60–80% of appraised value — making them attractive to investors, real estate professionals, and due-diligence researchers. Each listing is accompanied by a 3-point-set PDF bundle (物件明細書, 現況調査報告書, 評価書) containing title details, current status, and valuation reports.

What This Actor Extracts

For each foreclosure listing:

Field Description
case_number Court case number (事件番号), e.g. 令和07年(ケ)第270号
court_name District court name
court_branch Branch name (支部); empty for main court
prefecture Prefecture slug (e.g. tokyo, osaka)
city City / ward / town
address_ja Full Japanese address
postal_code 7-digit postal code
latitude / longitude Geocoordinates from map embed
property_type land / house / land_house / mansion_unit / apartment / other
land_area_sqm Land area in m²
building_area_sqm Building floor area in m²
building_year Year constructed
building_age_years Building age in years
building_structure Structure type (木造, RC, 鉄骨, etc.)
floors Number of floors
rooms_layout Room layout, e.g. 3LDK
zoning Zoning classification
min_sale_price_jpy Reserve price 売却基準価額 (JPY)
min_bid_price_jpy Minimum bid 買受可能価額 (JPY)
deposit_required_jpy Required deposit 買受申出保証金 (JPY)
bid_period_start Bid window start (YYYY-MM-DD)
bid_period_end Bid window end (YYYY-MM-DD)
opening_date Announcement date 開札期日 (YYYY-MM-DD)
sale_round Auction round (1 = first, 2 = special sale)
occupancy_status vacant / tenanted / owner_occupied / unknown
three_point_set_url URL for 3-point-set PDF bundle
photos Listing photo URLs (pipe-separated)
listing_url Direct URL to BIT detail page
scraped_at Scrape timestamp (ISO 8601 UTC)

Input Parameters

Parameter Type Description
prefectures array Prefecture slugs to scrape (tokyo, osaka, etc.). Empty = all 47.
maxItems integer Maximum results. 0 = unlimited.
downloadThreePointSet boolean Download and summarize 3-point-set PDFs. Slower but extracts occupancy, defects, and valuation detail.
proxyConfiguration object Proxy settings. JP residential proxy recommended.

Prefecture Slugs

All 47 prefectures are supported: hokkaido, aomori, iwate, miyagi, akita, yamagata, fukushima, ibaraki, tochigi, gunma, saitama, chiba, tokyo, kanagawa, niigata, toyama, ishikawa, fukui, yamanashi, nagano, gifu, shizuoka, aichi, mie, shiga, kyoto, osaka, hyogo, nara, wakayama, tottori, shimane, okayama, hiroshima, yamaguchi, tokushima, kagawa, ehime, kochi, fukuoka, saga, nagasaki, kumamoto, oita, miyazaki, kagoshima, okinawa.

Example Output

{
  "case_number": "令和07年(ケ)第270号",
  "court_name": "東京地方裁判所",
  "court_branch": "",
  "prefecture": "tokyo",
  "city": "目黒区",
  "address_ja": "東京都目黒区中町二丁目",
  "postal_code": "153-0065",
  "latitude": 35.632,
  "longitude": 139.693,
  "property_type": "mansion_unit",
  "land_area_sqm": null,
  "building_area_sqm": 58.32,
  "building_age_years": 28,
  "building_year": 1997,
  "building_structure": "鉄筋コンクリート造",
  "floors": 14,
  "rooms_layout": "2LDK",
  "zoning": "第一種住居地域",
  "min_sale_price_jpy": 32000000,
  "min_bid_price_jpy": 25600000,
  "deposit_required_jpy": 6400000,
  "bid_period_start": "2026-05-12",
  "bid_period_end": "2026-05-19",
  "opening_date": "2026-05-26",
  "sale_round": 1,
  "occupancy_status": "vacant",
  "three_point_set_url": "https://www.bit.courts.go.jp/app/detail/pd001/h04?courtId=31111&saleUnitId=00001234567",
  "photos": "https://www.bit.courts.go.jp/data/image/...",
  "listing_url": "https://www.bit.courts.go.jp/app/propertyresult/pr001/h05?saleUnitId=00001234567&courtId=31111",
  "scraped_at": "2026-05-18T10:00:00.000Z"
}

How It Works

  1. Fetches the BIT schedule index listing all district courts
  2. Filters courts by requested prefectures (using the court ID to prefecture mapping embedded in the index)
  3. For each court, reads the upcoming auction schedule
  4. POSTs to the results listing endpoint for each scheduled auction period
  5. Fetches the full detail page for each listing
  6. Optionally checks the 3-point-set PDF availability

The actor uses a residential Japanese IP proxy to ensure reliable access to the government server. Rate limiting (300ms between GET requests, 800ms between POST requests) prevents overloading the court system.

Notes

  • BIT only lists active auctions — concluded sales and historical data are not available
  • Some listings appear multiple times with different case_number entries when a case has multiple properties
  • sale_round: 2 indicates a "special sale" (特別売却) — a second-chance auction at a lower price
  • The 3-point-set PDFs require a separate download session; set downloadThreePointSet: true for occupancy and defect details
  • Japanese dates (和暦 era dates) are automatically converted to Gregorian (YYYY-MM-DD)
  • Dates are 和暦 on the BIT pages: 令和 = 2018+year, 平成 = 1988+year, 昭和 = 1925+year
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