Format messy JSON into readable output. Validate syntax with error highlighting. Minify for production. Browser-based.
JSON formatting adds indentation and line breaks to make JSON data human-readable. Minifying removes all whitespace to reduce file size.
Yes — all processing happens in your browser. No JSON data is ever sent to a server.
Yes! Click Validate or just start typing — errors are highlighted in real time with the line and position of the problem.
Paste your JSON into the input box and click Format JSON. The tool validates and pretty-prints the JSON with proper indentation and syntax highlighting. Click Minify to compress it back.
If your JSON contains errors (missing comma, unclosed bracket, invalid value), the formatter shows an error message with the problem location. Fix the error and format again.
Instantly format messy or minified JSON into readable, indented output. Validate syntax with precise error messages. Minify JSON for production use. Explore JSON as a tree structure. Essential for API developers, backend engineers, and anyone working with data.
All JSON processing happens in your browser using native JavaScript. API responses, configuration files, and sensitive data never leave your device.
Paste your JSON string into the input field.
Click Format to beautify, or Minify to compress.
See instant error messages with line/column information.
Copy the formatted JSON or download as a .json file.
JSON formatting (or "pretty printing") adds indentation and line breaks to make JSON human-readable.
Minifying removes all whitespace and line breaks to create the smallest possible JSON string — useful for APIs and storage.
Yes — syntax errors are highlighted with the exact line and character position.
Standard JSON does not support comments. Strip comments before formatting.
No hard limit — the browser handles large JSON. Very large files (>10 MB) may be slow.