JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser.
100% Client-Side • Privacy ProtectedFeatures
- Format and beautify JSON with customizable indentation (2 spaces, 4 spaces, or tabs)
- Validate JSON syntax with detailed error messages and line numbers
- Minify JSON to reduce file size for production use
- Real-time preview as you type
- Support for large JSON files up to several megabytes
How to Use the JSON Formatter
- 1Paste your JSON data into the input area on the left
- 2Click "Format" to beautify or "Minify" to compress your JSON
- 3View validation results — valid JSON shows a green indicator, errors show details
- 4Click "Copy" to copy the formatted output to your clipboard
Frequently Asked Questions
Is my JSON data safe?
Yes, absolutely. All JSON processing happens entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data is never sent to any server.
What is the maximum JSON size supported?
PureKit can handle JSON files up to several megabytes. Processing happens in your browser, so performance depends on your device's capabilities.
Can I validate JSON with comments?
No, standard JSON doesn't support comments. If your JSON file has lines starting with // or /* */, the validator will show syntax errors. Tip: If you're using JSON for configuration files (like VS Code settings), you may be using JSONC or JSON5, which allow comments. Our validator only checks standard JSON. You can remove the comments first, or use a JSONC/JSON5-specific tool.
What's the difference between Format and Minify?
Format (beautify) adds indentation and line breaks to make JSON human-readable. Minify removes all unnecessary whitespace to produce the smallest possible output, ideal for production use or API payloads.