JSON
JSON Formatter
Paste JSON, choose indentation, and format it locally with helpful parse errors and downloadable output.
Runs locally in your browser. Your input is not uploaded.
How this tool works
Pretty printing makes nested JSON easier to scan, review, and debug.
The formatter waits for the format action, which avoids repeatedly parsing large pasted input while typing.
Examples
- Format an API response with 2-space indentation.
- Download a readable JSON file after pasting minified data.
Common use cases
API debugging
Config review
Readable test fixtures
FAQ
Does formatting change JSON values?
No. Formatting changes whitespace only after the input parses as valid JSON.
Why is my JSON not formatting?
The parser reports syntax errors such as missing commas, unquoted keys, or trailing commas.