✅ JSON Validation
Instantly validate JSON syntax and catch errors. Our JSON validator provides clear error messages to help you fix malformed JSON quickly.
JSON Formatter - Free Online JSON Validator & Beautifier Tool
Format, validate, and beautify JSON data instantly. Our free JSON formatter tool validates JSON syntax, formats with proper indentation, and provides detailed statistics. Perfect for developers and API testing.
JSON Formatter Tool
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How to Use the JSON Formatter
1
Paste JSON Data
Copy and paste your JSON data into the input textarea above. You can paste minified or already formatted JSON.
2
Choose Formatting Options
Select your preferred indentation size (1-8 spaces) and enable auto-format if you want real-time formatting as you type.
3
Format JSON
Click the "Format JSON" button to beautify and validate your JSON data. Any syntax errors will be highlighted with clear error messages.
4
Review and Copy Results
Check the formatted output and statistics. Use "Copy to Clipboard" to copy the formatted JSON, or "Minify" to compress it for production use.
Why Use Our JSON Formatter?
🎨 JSON Beautifier
Transform minified JSON into readable, properly indented format. Customize indentation size for your preferred coding style.
📊 JSON Statistics
Get detailed insights about your JSON data including file size, number of objects, arrays, and overall structure analysis.
⚡ Real-time Processing
Format and validate JSON as you type with auto-format mode. No waiting - see results instantly as you work with your JSON data.
Perfect for Developers & API Testing
🔧 API Development
Format API responses, validate request payloads, and debug JSON data structures. Essential tool for REST API development and testing.
📝 Configuration Files
Format and validate JSON configuration files for applications, package.json files, and other JSON-based configuration systems.
🐛 Debugging
Quickly identify JSON syntax errors, malformed structures, and validate data integrity in your applications and APIs.
📚 Learning & Education
Perfect for students learning JSON syntax, developers new to APIs, and anyone wanting to understand JSON data structure better.
JSON Formatting Tips
🔍 Common JSON Errors
Watch out for trailing commas, unquoted keys, single quotes instead of double quotes, and missing closing brackets or braces.
📏 Indentation Best Practices
Use 2 or 4 spaces for indentation. Consistent indentation makes JSON more readable and easier to debug.
🚀 Performance Tips
Minify JSON for production APIs to reduce file size and improve loading times. Use formatted JSON for development and debugging.
JSON Formatter FAQ
Common questions about formatting and validating JSON
Yes, absolutely. All JSON processing happens locally in your browser using JavaScript. Your data never leaves your device or gets sent to our servers, ensuring complete privacy and security for sensitive data.
Our JSON validator can detect all common syntax errors including: trailing commas, unquoted property names, single quotes instead of double quotes, missing brackets or braces, invalid escape sequences, and malformed number formats.
Yes, our tool can handle large JSON files efficiently. For extremely large files (over 10MB), processing may take a few seconds depending on your device performance, but there are no artificial size limitations.
Formatting (beautifying) adds proper indentation, line breaks, and spacing to make JSON human-readable. Minifying removes all unnecessary whitespace to create the smallest possible file size, ideal for production APIs.
Yes, our JSON formatter supports all standard JSON data types: strings, numbers, booleans, null, objects, and arrays. It also handles nested structures of any depth and validates according to the official JSON specification.
Yes, you can customize the indentation size from 1 to 8 spaces. You can also toggle auto-formatting mode and choose between formatted (beautified) or minified output based on your needs.