JSONKit
47 free JSON tools ā€” all in your browser, zero uploads
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Hiren

JSONKit - 47 free JSON tools ā€” all in your browser, zero uploads

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JSONKit is a free collection of 47 browser-based JSON tools built for developers. Format, validate, minify, diff, and convert JSON to CSV, YAML, XML, TypeScript, Go, Python, Kotlin and more - all running locally in your browser. No upload. No login. No data sent anywhere. Works offline after first visit. Paste real API keys and production tokens without worry ā€” we literally cannot see them.

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Hiren
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Hey Product Hunt! šŸ‘‹ 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: šŸ”§ JSON Tools ā€” formatter, validator, minifier, diff, JSONPath tester, schema validator šŸ”„ Converters ā€” JSON ā†” CSV, YAML, XML + reverse directions šŸ’» Code Generators ā€” TypeScript interfaces, Go structs, Python dataclasses, Zod, Kotlin, Java, C#, Rust šŸ›  Dev Utilities ā€” 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 ā€” Next.js frontend, no backend, native JSON.parse/stringify for all processing. Would love your honest feedback: ā€” What tool is missing that you use daily? ā€” What would make you bookmark this over your current tool? Happy to answer anything about how it works technically !!!