Developer builds key-aware diff tool to fix false changes in CSV and JSON comparisons

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A developer identified a common flaw in standard diff tools: they compare files line by line, causing mass false positives whenever rows are reordered, inserted, or deleted in tabular data. To address this, they built a tool that matches rows by a detected key column — such as 'id' or 'slug' — rather than by line position, showing only genuine additions, deletions, or cell-level changes. The same key-aware logic extends to JSON and XML, preventing array reordering from generating misleading diffs. The toolkit also includes JSON-CSV-XML conversion, schema generation, and TypeScript or Zod interface rendering. It is available as a browser-based client-side tool, a CLI via npx, and a GitHub Action, accessible at tryrecast.app.

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