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Free online JSON formatter, validator, and beautifier tool. Format, validate, minify, and beautify JSON with syntax highlighting, tree view, and error detection. Perfect for developers, API testing, and data analysis.
Paste your JSON or upload a file
Ready to format
Enter JSON in the left panel to see formatted output here
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Discover the powerful features that make our tool the perfect choice for your needs
Format and beautify JSON with configurable indentation (2/4 spaces, tabs)
Validate JSON syntax with detailed error messages and line/column numbers
Minify JSON to compact format for production use
Syntax highlighting with dark/light theme support
Interactive tree view with collapsible nodes for large JSON
Upload JSON files up to 5MB for processing
Copy formatted JSON to clipboard with one click
Download formatted JSON as .json file
Sort object keys alphabetically (optional)
Real-time validation as you type
Error highlighting with precise location indicators
Client-side processing for maximum privacy and security
Mobile-responsive design with professional UI
Keyboard shortcuts for quick formatting (Ctrl+Enter)
Support for large JSON files with performance optimization
Follow these simple steps to get started
Paste your JSON code into the editor or upload a JSON file. The tool will automatically validate and format it.
Use the toolbar to beautify, minify, or validate your JSON. View errors with precise line and column numbers.
Use the tree view to explore large JSON structures, then copy or download the formatted result.
See Free JSON Formatter & Validator in action with these real examples
{"status":"success","data":{"users":[{"id":1,"name":"John","email":"john@example.com"}]}}
Properly formatted JSON with indentation and syntax highlighting for easy reading.
Format API responses for better readability and debugging.
Upload a config.json file with potential syntax errors.
Detailed error messages showing exactly where the JSON is invalid with line numbers.
Validate configuration files and fix JSON syntax errors quickly.
Complex JSON with nested objects and arrays containing thousands of items.
Interactive tree view allowing you to expand/collapse sections and navigate large datasets.
Explore and navigate complex JSON structures with the collapsible tree view.
Everything you need to know about Free JSON Formatter & Validator
Built with developers and creators in mind
All processing happens in your browser. We never see, store, or transmit your data.
Get instant results without waiting. Our tools are optimized for speed and performance.
No hidden costs, no premium tiers, no registration required. Access all features completely free.
Compatible with all modern browsers and devices. Use on desktop, mobile, or tablet.