JSON Formatter & Validator - Free Online Tool
Format, validate, minify, beautify, and convert JSON data instantly. Free, fast, secure, and optimized for developers.
JSON (JavaScript Object Notation) is the most popular data format for APIs and web applications. Properly formatted JSON is easier to debug, share, and document. This tool helps you validate, beautify, minify, convert, and share JSON with advanced features like tree view, error highlighting, converters, and more.
Paste your JSON below, upload a file, or use a sample to get started. What is JSON?
JSON Input
Paste or upload your JSON data here.
1
Characters: 0Lines: 1
Formatted Output
View formatted or minified JSON with syntax highlighting, tree view, and converters.
How to Use
- Paste your JSON in the input area or upload a .json file.
- Click Format to beautify, Minify to compress, or Tree View to explore the structure.
- Use the Converters to export as XML, CSV, or YAML.
- Copy, download, print, or share your formatted JSON.
- Use JSON Fixer to auto-fix common errors, or Copy as cURL for API testing.
Features
- Real-time JSON validation and error highlighting
- Beautify, minify, and auto-format JSON
- Tree view with collapsible nodes and image preview
- Converters: JSON to XML, CSV, YAML
- Copy, download, print, and share formatted JSON
- Sample JSONs and file upload support
- Shareable links and local storage for last input
- JSON Fixer for common syntax errors
- Copy as cURL for API testing
- Settings for indentation, theme, and auto-format
- Works offline (PWA-ready)
- Fully accessible and mobile-friendly
Why Choose Our Tool?
- No login, no ads, no distractions
- All processing is done in your browser for privacy
- Fast, secure, and trusted by developers worldwide
- Open source and regularly updated
- Supports all modern browsers and devices
- Backed by Abhay Talreja
Frequently Asked Questions
How do I format JSON?
Paste your JSON in the input area and click Format. The tool will beautify your JSON instantly.
Is my data secure?
Yes, all processing is done in your browser. No data is sent to any server.
Can I use this tool offline?
Yes, this tool works offline after the first load.
How do I convert JSON to XML, CSV, or YAML?
Use the converter tabs above the output to switch formats. For large/complex data, use a dedicated tool like JSON to XML.
Where can I learn more about JSON?
See MDN JSON Guide or Wikipedia.
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What Developers Say
“The best JSON formatter I have used. Love the tree view and instant validation!”
— Priya S.