Format Large JSON Files & Pretty Print
The fastest way to format large JSON files online. Our free tool provides pretty print JSON with syntax highlighting and instant error detection. Secure and 100% private.
Free JSON Formatter & Validator
Format, validate, and minify JSON data online. Perfect for developers, API testing, and data processing. Includes error detection and JSON analytics.
Features:
- • Real-time JSON validation
- • Pretty formatting with custom indentation
- • JSON minification for production use
- • Error detection with line numbers
- • JSON analytics and statistics
- • File upload and download support
- • Key sorting option
- • Copy to clipboard functionality
Common Use Cases:
- • API response formatting
- • Configuration file validation
- • Data structure analysis
- • JSON debugging and troubleshooting
- • Code documentation preparation
- • Database export formatting
- • JSON schema validation
- • Production optimization
What's the difference between formatted and minified JSON?
Formatted JSON includes proper indentation and line breaks for readability, while minified JSON removes all unnecessary whitespace to reduce file size for production use.
How does error detection work?
Our validator parses your JSON and provides detailed error messages with line and column numbers to help you quickly identify and fix syntax issues.
Is my JSON data safe?
Yes, all JSON processing happens locally in your browser. Your data is never sent to our servers, ensuring complete privacy and security.
What file formats are supported?
You can upload .json and .txt files. The tool will attempt to parse any text content as JSON and provide appropriate validation feedback.
Format API Response
Clean up messy JSON from API responses for better readability
What Developers Say About Our JSON Formatter
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Alex Johnson
VerifiedAmazing collection of tools
30tools has become my go-to for all online utilities. Every tool I've used works perfectly and the fact that it's all free is incredible. No ads, no watermarks!
Maria Garcia
VerifiedReliable and fast
Been using these tools for months now. They're consistently reliable and much faster than similar tools I've tried. The privacy-first approach is a huge plus.
James Wilson
VerifiedProfessional quality tools
As a freelancer, I need tools that work reliably without breaking the bank. 30tools delivers professional-grade utilities completely free. Highly recommended!
Everything you need to know about json formatting & validation
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