JSON Formatter
Format and pretty-print JSON with 2, 4 or 8-space indentation, sort object keys, or see the exact syntax error with its line and column — all processed in your browser.
JSON Formatter
Validate and pretty-print JSON with 2, 4 or 8-space indentation.
How to use
The whole flow runs in your browser — nothing is uploaded.
- Paste your JSONDrop in a response body, config file or payload.
- FormatPress Format — the JSON is parsed and reprinted with your chosen indent.
- Fix errorsIf the JSON is invalid, the exact line and column are shown in the error bar.
- ExportCopy the result or download it as a .json file.
- Every step runs locally in your browser.
Key Features
Validate and pretty-print JSON with clear syntax errors. Everything runs client-side on your own device.
- Real validationYour input is parsed with JSON.parse before anything is output.
- Indent controlTwo, four or eight spaces, or tab-style indentation.
- Precise error positionsThe reported line and column match the exact character that broke parsing.
- Client-sideYour JSON is never uploaded.
Frequently asked questions
No. The text is parsed and reprinted, so values, key order and types are preserved — only whitespace changes.
Common causes are trailing commas, single quotes, unquoted keys and comments. The error bar points at the exact line and column that failed.
No — key order is preserved exactly as written, because reordering keys can change the meaning of some payloads.