JSON Formatter
Format, validate, and minify JSON online โ instantly. Clean indentation, precise error messages, and 100% browser-side privacy. No signup required.
Formatted JSON will appear here...
๐ก Note: All processing happens in your browser. Your JSON never leaves your device โ safe for API responses, configs, and files containing sensitive data.
How to Use the JSON Formatter
Paste Your JSON
Paste API responses, config files, or any raw JSON into the input box. You can also click "Load sample" to see how the tool works with example data.
Format, Minify or Validate
Click "Format JSON" for pretty-printed output with 2-space indentation, "Minify" for compact production-ready JSON, or "Validate" to check syntax and see the result.
Copy the Output
Click "Copy Result" to grab the formatted JSON for your editor, API client, or documentation. If the JSON is invalid, the exact error with position is shown in red.
๐ก Common JSON Errors & Fixes
Trailing comma: {"a":1,} โ remove the comma before the closing brace.
Single quotes: JSON only allows double quotes {"a":"1"}.
Comments: JSON does not support // or /* */ โ remove them before validating.
Unquoted keys: Keys must always be in double quotes: {"key": value}.
Frequently Asked Questions
How do I format JSON from an API?โผ
Copy the raw response body from your API client (Postman, Insomnia, browser dev tools) and paste it here. Click Format JSON and the tool will indent every level with 2 spaces and sort it for readability.
Can this tool handle large JSON files?โผ
Yes. The tool processes JSON in your browser and can handle files with hundreds of thousands of lines. Very large files (100MB+) may be limited by browser memory.
Why would I minify JSON?โผ
Minified JSON removes all whitespace and line breaks, reducing file size by up to 30-40%. Smaller payloads mean faster API responses and lower bandwidth costs, which is why production configs are usually minified.
Is this different from an XML formatter?โผ
Yes. JSON and XML are different formats with different syntax rules. This tool is specifically built for JSON. For XML or other code formatting needs, use our developer tools directory.
Can I format JSON in VS Code with this?โผ
This web tool is a quick option when you don't have an editor open. In VS Code you can also use Shift+Alt+F (Windows/Linux) or Shift+Option+F (Mac) to format JSON natively.