Spreadsheet Quality Checker — Local Browser Demo

Self-directed demo by Methodarc Research. This is not client work.

I designed and built a local-first browser tool that checks CSV and XLSX files for missing values, duplicate rows, mixed data types, and whitespace issues, then exports a structured issue list. Files stay in the browser instead of being uploaded to a third-party service.

What the demo includes

• CSV/XLSX import and sample-data mode
• Missing-value, duplicate, type-consistency, and whitespace checks
• Clear issue summaries and downloadable output
• Responsive browser interface

Verification completed

• Five automated audit and XLSX tests passed
• Server-render smoke test passed
• Production build passed

I can adapt the same workflow to a client’s agreed data rules, add validation checks, or package a lightweight reporting interface.