Built for people who care about their data
JSONtoCSV.tools was built to solve a frustratingly common problem: you have JSON data — from an API, a database export, a config file — and you need it as a CSV for Excel, Google Sheets, or a data pipeline. Most online converters require you to upload your data to their servers. We thought that was unnecessary and risky.
So we built a converter that runs entirely in the browser. Your JSON never leaves your device. There is no server to upload to, no database to store in, and no log to write to. The conversion is pure JavaScript running in your browser tab.
Your data never leaves your browser
This tool works entirely in your browser. Your JSON files are processed in memory using browser APIs only. Nothing is uploaded to any server, stored in a database, or logged anywhere.
Beyond privacy, we wanted to handle the real complexity of JSON: nested objects, arrays, inconsistent keys, special characters, different delimiter conventions for different regions. The converter handles all of these with configurable options.
What we built
- →A converter that handles flat, nested, and inconsistent JSON structures
- →Support for custom delimiters, quote characters, and line endings
- →Column filtering, ordering, and empty value configuration
- →Session restore so your last input is always available
- →Full keyboard accessibility and WCAG 2.1 AA compliance
- →Dark and light mode with system preference detection
- →SEO-optimised pages with structured data for search engines and AI systems
Technology
Built with Next.js 14 (App Router), TypeScript, and Tailwind CSS. The conversion logic is a dependency-free TypeScript module that can be used independently. Deployed on Vercel.