JSON Studio — Online JSON Editor, Formatter, Validator & Converter

A free JSON editor that runs entirely in your browser. Your data never leaves the device: there is no backend, no upload and no tracking.

Features

• Edit — text view with CodeMirror 6, tree view for exploring, table view for arrays of objects
• Format & minify — pretty-print with 2 or 4 spaces or tabs, smart compact layout, or collapse to one line
• Validate & repair — precise line/column errors, and repair for comments, trailing commas and unquoted keys
• Compare — inline diff in text, tree or table view with word-level highlighting and next/previous change jumps
• Search & replace — regex, case sensitive and whole word, highlighted down to the matched characters
• Query — JSONPath, JMESPath, JSON Query and JSON Pointer, results can be written back to a pane
• Schema — validate against a JSON Schema with Ajv, or infer a schema from your data
• Convert — JSON to and from YAML, TOML, XML, JSONL and CSV; generate TypeScript, Zod, Go, Java, SQL and JSON Schema
• Large files — 50 MB+ documents are validated in a background worker while the editor stays responsive
• Share — compress a document into a URL fragment, copy formatted or minified output, export to CSV

Enable JavaScript to use the interactive editor.