JSON Formatter
Beautify, minify, and validate JSON with real-time stats.
What is a JSON Formatter?
A JSON formatter makes raw JSON data easier to read by adding consistent indentation, line breaks, and spacing. It also validates that your JSON syntax is correct — highlighting errors before you use the data in your application.
Developers use JSON formatters when inspecting API responses, debugging configuration files, reviewing log output, or preparing data for documentation.
Beautify vs Minify vs Validate
Beautify
Adds indentation and line breaks to make JSON human-readable. Useful for inspecting data and writing documentation.
Minify
Removes all whitespace to produce the smallest possible JSON string. Useful for APIs and network transmission.
Validate
Checks syntax correctness. Reports the exact line and character position of errors like missing commas or unclosed brackets.
Common JSON Errors
- Missing comma between object properties or array elements
- Trailing comma after the last item (not valid in JSON, only in JavaScript)
- Unquoted property names — all keys must be double-quoted strings
- Single quotes instead of double quotes around strings
- Unclosed brackets
{or[ - Comments — JSON does not support
// comments
FAQ
Is my JSON data sent to a server?
No. The formatter runs entirely in your browser using JavaScript. Your JSON data never leaves your device.
Can I format large JSON files?
Yes. The tool handles large JSON in the browser. Very large files (10 MB+) may take a moment depending on your device.
What indentation options are available?
You can choose 2-space, 4-space, or tab indentation to match your project code style.
Can I download the formatted JSON?
Yes. Use the Download button to save the formatted output as a .json file.
Does the formatter support JSON5 or JSONC?
The formatter validates standard JSON (RFC 8259). Comments and trailing commas are not supported as they are not valid JSON.