Why use this formatter?
- Pretty-print with custom indent or minify for compact payloads.
- Live validation while you type with clear line/column pointers.
- Copy formatted JSON with one click; no uploads or tracking.
- Works well for logs, config files, and quick API experiments.
Validate fast
Format and debug JSON
Paste JSON, pick an indent, and format or minify. Errors are highlighted automatically with a caret under the position.
Parsing runs locally. Empty input stays empty without errors.
Preview
How to use this formatter
Use this page when you need to quickly validate a JSON payload, fix a parse error, and copy a clean result without sending anything to a server.
Recommended workflow
- Paste the original JSON and confirm whether the live validator reports an error.
- Use Format when you want readable indentation, or Minify when you want compact JSON for transport.
- Before copying, confirm the indent size and make sure escaped characters still match your intended payload.
What this tool does not change
- It does not round numbers or alter numeric precision.
- It does not upload your JSON anywhere.
- It does not repair invalid syntax automatically; it only shows you where the error is.
Frequently asked questions
Will my JSON be uploaded?
No. Parsing, formatting, and error highlighting happen only in your browser, so sample payloads stay on your device.
How are errors highlighted?
When parsing fails, the tool shows the line and column plus a caret under the exact position so you can fix it quickly.
Does this tool round numeric values?
No. The formatter uses the browser's JSON parser and serializer. It changes whitespace and layout, but it does not round numbers for display.
What is the difference between Format and Minify?
Format adds indentation and line breaks for readability. Minify removes extra whitespace so the JSON becomes compact.
What should I review before copying formatted JSON?
Check that the parse error is gone, confirm the indent size you want, and make sure escaped characters still match your original intent.