JSON Toolkit — Format, Validate & Convert JSON Online
Format, validate, convert, compare and query JSON — fast, private and free. No uploads, no sign-up. Try the formatter right here.
Every JSON tool you need
Seven focused tools that work together. Pick one to get started.
Private by design
All formatting, validation and conversion runs in your browser. Your JSON never touches a server.
Fast & interactive
Resizable panes, a command palette (⌘K), keyboard shortcuts and instant client-side feedback.
Built for scale
Handle large documents with an efficient editor, lazy-loaded per tool to keep everything snappy.
Free online JSON tools
JSON Toolkit is a free, all-in-one platform for working with JSON. Whether you need to format and beautify JSON, validate JSON against a schema, compare two JSON files, convert JSON to CSV, YAML or TypeScript, or run JSONPath queries, everything works instantly in your browser.
Because the tools are client-side, your data stays private and there is nothing to install. Save documents to get clean, shareable public links you can send to your team.