What this tool does
JSON Formatter will first use the standard JSON parser to validate the input, and then re-output it with uniform indentation. It only changes whitespace and newlines. It will not accidentally delete spaces in the string, nor will it overwrite the original content you pasted.
- Supports 2-space and 4-space indentation.
- Syntax errors will display the line number, column number, and reason returned by the browser whenever possible.
- The formatted results can be copied or downloaded as a .json file.
How to use it
- Paste the JSON that needs to be sorted.
- Choose 2-space or 4-space indentation.
- Click "Format" to check the results or error messages.
- Copy the results, or download formatted.json.
Common uses
- Check the hierarchy of API responses and configuration files.
- Organize single lines of JSON into a format that's easy for code review.
- Missing commas, quotes, or brackets were discovered before committing the configuration.
JSON Formatter Features
Reformat valid JSON into 2 or 4 spaces and point out common syntax errors. It is suitable for daily development, debugging, data sorting and code optimization scenarios. The processing results can be directly viewed, copied or downloaded.
FAQ
Will JSON Formatter modify field values?
No. The tool will parse and reserialize the data, adjusting only the indentation and newlines outside the JSON; whitespace inside the string value will be preserved.
Why do comments report errors?
Standard JSON does not support // or /* */ comments, nor does it allow trailing commas. This tool validates according to standard JSON syntax.
Is the original content still there when formatting fails?
Yes. The original input is preserved. Errors only clear the previous output and show the reason; the JSON in the input field is not replaced.