I built a free JSON formatter that never uploads your data — here's why that matters

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