If you've ever pasted an API response with credentials or sensitive data into an online JSON formatter, you've probably uploaded that data to a third-party server without realizing it.
Most online JSON tools process data server-side. That means your JSON goes to their servers before coming back formatted.
I built JSONStudio (https://jsonstudio.online) differently — everything runs 100% in your browser using client-side JavaScript. Your data never leaves your device.
What it does
JSON Formatter — beautify and minify with custom indentation
JSON Viewer — explore in Tree, Table, Code, or Text view
JSON Validator — real-time error detection with exact line/column
JSON Diff — compare two JSON files side by side
20+ Converters — JSON → TypeScript, YAML, CSV, Java, Go, Kotlin, XML, GraphQL, Rust, Scala, Zod Schema, and more
Why client-side matters
When working with API responses, you often have:
Authentication tokens
User personal data
Internal API structure
Credentials in config JSONs
With client-side processing, none of that leaves your machine.
Tech stack
Built with Next.js (static export), deployed on a CDN. The output: 'export' config means there's no Node.js server involved at all — it's all static HTML + JS.
Try it at https://jsonstudio.online — feedback welcome!
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