I Built a Price History Tracker for Japan's 4 Major E-Commerce Sites (Amazon.co.jp, Rakuten, Yahoo!, Mercari)

Short summary

Developer built PricePulse JP, a Chrome extension unifying price tracking across Amazon.co.jp, Rakuten, Yahoo! Shopping, and Mercari. Engineering solutions included CSS selector fallback chains for Amazon and schema.org metadata parsing for other platforms. Uses IndexedDB for local storage and Chrome background alarms for price monitoring, free for 10 items or paid unlimited.

• •Built PricePulse JP Chrome extension for unified price tracking across 4 Japanese e-commerce platforms
• •Solved DOM parsing fragmentation using CSS selector chains and schema.org metadata parsing as fallback
• •Freemium model: local IndexedDB storage, Chrome Alarms for background monitoring, 10 items free / paid for unlimited

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