ToolGenius

Toolgenius.app is an online data-conversion toolkit built for developers, analysts, and anyone who handles tabular data. Its flagship CSV ⇄ JSON converter completes round-trip transformations in milliseconds while keeping your files 100 % on-device—thanks to a fully client-side, open-source core licensed under MIT.

Key capabilities
• Bidirectional conversion – CSV→JSON and JSON→CSV with one click
• Zero-upload privacy   – all parsing and formatting happen inside the browser
• Large-file support    – stream-based processing up to tens of MB without crashes
• Flexible options     – custom delimiters, header toggle, BOM detection, pretty-print
• Mobile-ready UI     – responsive design, no ads, no pop-ups

Typical use cases
• Quickly mocking API responses from a spreadsheet
• Cleaning CSV exports before importing into a database
• Embedding a live converter link in tutorials or classroom demos

Roadmap
Support for TSV, YAML, SQL-INSERT, and Go/TypeScript struct generation is underway. The underlying library, conversion-tools-core, is available on GitHub for self-hosting and contributions.

Pricing
Free forever. No registration required.