Hey Product Hunt! 👋 I'm Hiren, a developer from Surat, India. I built JSONKit because I was tired of pasting API responses and JWT tokens into online tools I couldn't trust. The core idea: every tool runs entirely in your browser. Nothing is sent to a server. You can paste real production data, API keys, and JWT tokens without sanitising first. What's included: 🔧 JSON Tools — formatter, validator, minifier, diff, JSONPath tester, schema validator 🔄 Converters — JSON ↔ CSV, YAML, XML + reverse directions 💻 Code Generators — TypeScript interfaces, Go structs, Python dataclasses, Zod, Kotlin, Java, C#, Rust 🛠 Dev Utilities — JWT decoder, Base64, UUID, Hash generator, cURL converter, ENV parser All 47 tools are free. No login. No account. Works offline. I built the entire thing solo — Next.js frontend, no backend, native JSON.parse/stringify for all processing. Would love your honest feedback: — What tool is missing that you use daily? — What would make you bookmark this over your current tool? Happy to answer anything about how it works technically !!!

JSONKit

47 free JSON tools — all in your browser, zero uploads

47 free JSON tools — all in your browser, zero uploads