Niche Collector App Tracks Hobby Portfolio Value Using Structured Data and GROQ Queries

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A developer has built Niche Collector, an open-source portfolio tracker for hobbyists collecting items such as Hot Wheels, Gunpla kits, and mechanical keyboards. The app compares purchase prices against current market values by pulling price history from Indonesian marketplaces like Tokopedia and Shopee. A key feature flags suspiciously high listings as outliers and excludes them from median valuations, keeping portfolio calculations accurate. The project was submitted as part of a Sanity CMS developer challenge and is built on Next.js with Sanity's structured content backend. All financial aggregations are computed server-side using GROQ queries rather than client-side JavaScript, demonstrating use cases that full-text search cannot handle.

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