JSON Formatter & Validator
Format, validate, and beautify JSON data. Minify for production. All processing happens locally in your browser.
Completely Private
- Processing in your browser
- JSON never sent to servers
- Safe for API responses
Features
- 📝 Pretty print JSON
- 📦 Minify JSON
- ✓ Validate syntax
- 📏 Custom indentation
- 📋 One-click copy
- 🔒 100% private
Common JSON Errors
- Trailing commas: JSON doesn't allow commas after the last item
- Single quotes: Use double quotes for strings
- Unquoted keys: Object keys must be quoted
- Comments: JSON doesn't support comments
Frequently Asked Questions
What is JSON formatting?
JSON formatting adds proper indentation and line breaks to make JSON data human-readable. Minified JSON removes all whitespace for smaller file size.
How do I validate JSON?
Paste your JSON and click Format. If there's an error, we'll show you exactly where it is. Common issues include missing commas, unquoted keys, or trailing commas.
What's the difference between format and minify?
Format adds whitespace for readability. Minify removes all unnecessary whitespace for the smallest possible size - useful for APIs and production.
Is my JSON data sent to a server?
No. All processing uses built-in browser JavaScript (JSON.parse/stringify). Your data stays in your browser. Safe for sensitive API responses or configs.
Can I format large JSON files?
Yes, but very large files may be slow. Browser memory limits apply. For files over 10MB, consider using a desktop tool instead.
Why does my JSON have errors?
Common issues: trailing commas (not allowed in JSON), single quotes (must use double), unquoted keys, or missing commas between items. Our error messages show the exact location.