JSON Formatter
Paste JSON to validate, pretty-print with indentation, and browse a collapsible tree. Copy or download the formatted output.
How to jSON Formatter
- Paste or type JSON in the editor.
- Click Format & validate.
- Copy the result or download formatted.json.
How to format JSON without uploading files
Private by design — JSON is parsed and formatted entirely in your browser. Nothing is sent to a server.
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Frequently asked questions
Does it fix invalid JSON?
It reports errors with line and column hints but does not auto-repair. Fix the syntax and format again.
Is there a size limit?
Very large JSON may slow the browser. For huge payloads, use a desktop editor or split the file.