Can I format large JSON files?

Yes, though very large files (several megabytes) may take a moment to process depending on your browser.

Does this support JSON with comments?

Standard JSON does not allow comments. If your input contains comments or trailing commas, the validator will report an error.

No. All parsing and formatting happens locally in your browser. Your data never leaves your device.

Format, validate, and minify JSON with clear error messages.

Runs locally — nothing is uploaded

1
Paste your JSON
Paste raw or minified JSON into the input area. The tool accepts objects, arrays, and nested structures.
2
Format or minify
Click Format to beautify with proper indentation, or Minify to remove whitespace. Invalid JSON shows an error with the line number.
3
Copy the output
Once formatted, use Copy to grab the result. Valid JSON is highlighted with clear structure for easy reading.

The tool parses your input with JSON.parse(). If syntax is invalid, you see an error message with the approximate line where the problem occurs.

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