Dev Tools · 2h ago
Building a Price Scraper for Japan's Fragmented E-Commerce
A developer built Arbitra, a Chrome extension that scrapes prices from Amazon.co.jp, Rakuten, Mercari, and Yahoo! Auctions without official APIs. The extension uses multiple CSS selectors with fallbacks to handle site redesigns. It extracts pricing data from the DOM to help users compare prices across platforms.
Meridian48 take
The approach is pragmatic but highlights the fragility of DOM scraping—site updates can break selectors, and relying on fallbacks is a band-aid, not a solution.
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Scraping Prices Without an API: Chrome Content Script Patterns for Japanese E-Commerce →
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