Private by design: JSON is formatted in your browser and is not uploaded to ShishwaLab servers.
Paste JSON to format or minify.
Output size0 B
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JSON Formatter
Format and minify JSON locally with indent controls, validation feedback, copy, and download. Free, fast, and built for a clean browser workflow.
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About this tool
The ShishwaLab JSON Formatter is a free JSON beautifier and minifier that runs entirely in your browser. Use it to pretty-print API responses, config files, and payloads before sharing or committing them.
Invalid JSON shows a clear parse error with line and column when the browser reports a position. Valid JSON can be formatted with 2- or 4-space indent or compacted to a single line.
Your JSON is processed locally and is not uploaded to ShishwaLab servers.
Tips for better results
- Use Format for readable reviews; use Minify before storing or sending compact payloads.
- If parsing fails, fix the reported line/column first—trailing commas and single quotes are common issues.
- Large inputs are capped for browser performance; split huge dumps when needed.
- Pair with JSON Validator when you only need a pass/fail check and structure summary.
How to use
- 1 Paste JSON into the input field (or load the sample).
- 2 Choose an indent size, then click Format or Minify.
- 3 Copy or download the result, or reset to start over.
Developer notes
Pretty-print and minify without leaking payloads
API bodies and configs often contain secrets. Formatting locally keeps those strings off third-party beautifier servers while you debug structure.
Pretty-print
Adds consistent indentation so nested objects and arrays are scannable. Ideal before code review or diffing.
Minify
Strips insignificant whitespace for compact transport. Validate after hand-edits before shipping.
JSON ≠ JS objects
Trailing commas, single quotes, and comments fail pure JSON even when JavaScript literals allow them.
Next step
If two payloads disagree, format both and compare with the Text Diff Checker so whitespace does not hide real changes.
FAQ
Is this JSON formatter free?
Yes. Format and minify JSON in your browser with no account or paid API.
Is my JSON uploaded?
No. Formatting runs locally in your browser and is not uploaded to ShishwaLab servers.
Can I minify JSON?
Yes. Use Minify to collapse whitespace into a compact string.
What indent sizes are supported?
Choose 2-space or 4-space indentation for pretty-printed output.
What happens with invalid JSON?
You get an error message with line/column details when available, and no fake output is shown.
Can I download the result?
Yes. Download a .json file, copy to the clipboard, or reset the form.