Format JSON
Beautify JSON with readable indentation directly in your browser.
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About JSON Formatter
JSON Formatter makes JSON easier to read by adding indentation and line breaks while keeping the data unchanged. It is useful for API responses, configuration files, debugging, and code review. Formatting happens in your browser so sensitive JSON stays local.
How to Format JSON Online
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1
Paste JSON into the editor
Copy your JSON object or array into the input panel.
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2
Choose indentation and format
Pick the indentation size you want and run the formatter to generate readable output.
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3
Copy or download the result
Review the formatted JSON, then copy it or save it as a JSON file.
Frequently Asked Questions
Does formatting change my JSON data?
No. Formatting only changes whitespace and indentation, not the keys, values, or structure.
Can I choose different indentation sizes?
Yes. You can switch between several indentation sizes before formatting the JSON output.
Is this JSON formatter private?
Yes. The formatting runs locally in your browser, so your JSON is not sent to our servers.
What happens if the JSON is invalid?
The tool shows that the JSON is invalid and reports the error location when the browser provides it.
Why Choose Let Compress?
- No file upload required - 100% client-side processing
- Free to use with no registration needed
- Batch compress multiple files at once
- Optimized compression algorithms for best results
- Works on all modern browsers and devices
- No file size limits or compression quotas
Learn More About Image Compression
Explore these authoritative resources to deepen your understanding of image compression and optimization.
MDN Web Docs: Image Optimization
Comprehensive guide on image optimization for web performance by Mozilla.
Google Web Fundamentals: Image Optimization
Best practices for image optimization from Google's web performance team.
W3C WebP Specification
Official W3C specification for the WebP image format.