JSON Formatter
Beautify, minify and validate JSON with clear error locations, then copy or download the result.
The interactive tool loads here when JavaScript is enabled. Files are processed locally in your browser.
How to use JSON Formatter
- Paste or type JSON in the input box.
- Choose Beautify / Format for readable indentation, or Minify for a compact single line.
- Fix any reported error using the line and column shown, then copy or download the result.
Features
- Beautify JSON with readable indentation or minify it to a single line.
- Validation with the exact line and column of the first syntax error.
- Copy the result or download it as a .json file.
- Processing stays in your browser, so private data is not uploaded.
Supported formats and limitations
Input: pasted or typed JSON text. Output: formatted or minified JSON to copy or download (.json).
- Only standard JSON is accepted; JSON5 features such as comments are reported as errors.
Frequently asked questions
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, comments, and unquoted keys. The error message shows where parsing stopped.
Does formatting change my data?
No. Formatting only changes whitespace; keys, values and their order stay the same.
How large a file can I format?
Several megabytes work in modern browsers; very large files may be slow on older devices.