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JSONKit
47 free JSON tools — all in your browser, zero uploads
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 — we literally cannot see them.
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 !!!
About JSONKit on Product Hunt
“47 free JSON tools — all in your browser, zero uploads”
JSONKit was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #117 on the daily leaderboard. 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 — we literally cannot see them.
On the analytics side, JSONKit competes within Productivity, Developer Tools and Tech — topics that collectively have 1.8M followers on Product Hunt. The dashboard above tracks how JSONKit performed against the three products that launched closest to it on the same day.
Who hunted JSONKit?
JSONKit was hunted by Hiren. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of JSONKit including community comment highlights and product details, visit the product overview.
Hiren