exceltojson

This tool nails the balance of privacy, speed, and usability. All conversions run locally via WebAssembly, so no files ever leave the browser—ideal for sensitive workflows. Beyond bidirectional JSON ↔ Excel, it spans 50+ table-friendly formats (CSV, SQL, Markdown, HTML, XML, PDF, PNG, JPEG) in one unified interface, making the journey from preview to cleanup to export remarkably smooth. Multi-sheet export is thoughtfully engineered: nested objects expand into linked worksheets with foreign keys, preserving original JSON structure while remaining readable in Excel. Built-in data tooling—transpose, deduplicate, find/replace, type inference, and validation—turns routine cleanup into instant, inline actions. In practice, 50MB Excel files preview smoothly on modern browsers; for larger datasets, slice-first previews keep the UI responsive. Audience guidance is clear and effective: one-click conversions for office users, advanced flattening and array expansion for analysts, and NDJSON detection for developers. Overall, it’s a well-crafted data conversion workstation that consolidates scattered utilities and fits neatly into daily data operations.