Amazon Japan product data API

ShopAPIS extracts structured product data from Amazon Japan (amazon.co.jp) and returns it as clean JSON. For any Amazon JP listing you get title, ASIN, JAN barcode, current price, Buy Box seller, Prime eligibility, rating, review count, variant relationships, category rank and the image gallery — normalized into the same schema ShopAPIS uses for every other Amazon marketplace and East Asian platform.

Amazon Japan draws an estimated ~535M monthly visits (Dec 2025) with ~¥1.5T+ GMV and ~35M users, making it one of Japan’s top two marketplaces alongside Rakuten (plan2 research). Japan is a relatively API-friendly market, with ~55–60% of consumer GMV across three platforms that all offer official APIs.

Official API and where ShopAPIS adds value

Amazon offers official SP-API and Product Advertising API (PA-API) for Japan. These are excellent for sellers and affiliates but are gated by account eligibility, rate-limited and constrained in fields and in catalog breadth. ShopAPIS complements them by returning Buy Box winner, full review data, competitor offers and price history at scale across arbitrary ASINs, without requiring a Selling Partner account (Amazon SP-API ).

Why Amazon JP data needs care

Amazon JP applies bot detection, dynamic Buy Box rotation and per-session pricing, and renders much of the offer block client-side. Japanese-language titles and JAN-based catalog matching add normalization work. ShopAPIS handles detection, resolves the Buy Box and returns both raw Japanese and normalized fields.

Data fields returned

• Identity — ASIN, title, brand, JAN/EAN, category path, parent/child variant ASINs
• Price — current price, list price, Buy Box price, currency (JPY)
• Buy Box — winning seller, seller ID, fulfillment (FBA/FBM), Prime flag
• Availability — in-stock flag, ships-in estimate
• Ranking — best-seller rank by category
• Reviews — count, average rating, rating distribution, review text
• Media — image gallery, A+ content flag
• Offers — number of other sellers, lowest offer

Sample response

{
  "platform": "amazon_jp",
  "asin": "B0CXYZ1234",
  "url": "https://www.amazon.co.jp/dp/B0CXYZ1234",
  "title": "ソニー ワイヤレスノイズキャンセリングヘッドホン WH-1000XM5",
  "brand": "Sony",
  "jan": "4548736141234",
  "category_path": ["家電&カメラ", "オーディオ", "ヘッドホン"],
  "price": { "current": 41800, "list": 49500, "buybox": 41800, "currency": "JPY" },
  "buybox": { "seller": "Amazon.co.jp", "seller_id": "AN1VRQENFRJN5", "fulfillment": "FBA", "prime": true },
  "availability": "in_stock",
  "bestseller_rank": { "category": "ヘッドホン", "rank": 3 },
  "reviews": { "count": 12940, "rating": 4.6, "distribution": { "5": 71, "4": 18, "3": 6, "2": 2, "1": 3 } },
  "offers": { "total_sellers": 14, "lowest": 40900 },
  "variants": { "parent_asin": "B0CXYZ0000", "child_asins": ["B0CXYZ1234", "B0CXYZ5678"] },
  "images": ["https://m.media-amazon.com/images/I/1.jpg"]
}

Markets and domains covered

Amazon Japan is the amazon.co.jp marketplace, JPY-priced, Japanese-language. ShopAPIS resolves by ASIN, JAN or URL and returns data in the same schema as other Amazon marketplaces for cross-market comparison.

Use cases

• Buy Box and price monitoring — track the winning offer and price over time (/solutions/price-monitoring).
• MAP compliance — detect sellers breaching minimum advertised price (/solutions/map-compliance).
• Catalog enrichment — match by ASIN or JAN to your own catalog (/solutions/catalog-enrichment).
• Review analytics — analyze rating distribution and review sentiment (/solutions/review-analytics).

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