JSON Formatter and Validator
Indent, validate (with the line and column of the error), minify or convert JSON to CSV.
Processed in your browserFree
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About this tool
Paste JSON to validate it, format it with the indentation of your choice, sort its keys, minify it or convert it to CSV. On error, the tool pinpoints the line, the column and the cause (trailing comma, single quotes, unterminated string…), which browser messages do not always do.
How to use this tool
- 1Paste or import your JSON.
- 2Choose format, minify or convert to CSV; fix any reported errors.
- 3Copy or download the result.
Limits to know
- As required by the JSON standard, comments, trailing commas and single quotes are reported as errors.
- CSV conversion expects an array of objects; nested values are encoded as JSON inside the cell.
- Files up to 2 MB to stay responsive.
- Accepted formats
- JSON, Text
- Maximum size
- 2 MB
Privacy and file processing
Data is processed in your browser and is never sent to a server.
Read our privacy policyFrequently asked questions
Standard JSON allows neither comments, trailing commas nor single quotes. The tool reports these errors with the line and column; remove them or use a JSON5/JSONC format with another tool.
The conversion expects an array of flat objects. Nested values (objects, arrays) are encoded as JSON inside the cell; flatten your data before converting if you need one column per field.