JSON Formatter & Validator
Format, validate, and beautify JSON online. Free, instant, 100% private - your data never leaves your browser.
Free JSON formatter and validator. Beautify or minify JSON with syntax highlighting and error detection. 100% browser-based, data never uploaded.
- ✓ Format/beautify JSON with custom indentation (2, 4, or 8 spaces)
- ✓ Minify JSON to compact single line
- ✓ Real-time validation with detailed error messages
- ✓ Syntax highlighting for improved readability
- ✓ 100% client-side - data never leaves your browser
How to Format JSON
- 1 Paste your JSON data into the input field
- 2 Choose your preferred indentation level
- 3 Click 'Format' to beautify or 'Minify' to compact
- 4 Check the validation status for any errors
- 5 Copy the formatted output to your clipboard
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1