JSON Formatter & Validator
Beautify, validate, and minify JSON strings with real-time syntax highlighting. All processing happens in your browser.
10 lines
Input
Output — Beautified
Formatted JSON will appear here.
All processing happens on your device — no files or data are uploaded.
How to Use
- Paste your raw JSON into the Input box on the left.
- The formatted JSON with syntax highlighting will instantly appear on the right.
- If there is a syntax error, a warning with details will appear below the input.
- Choose indentation settings or click Minify to collapse the JSON.
- Click the Copy button to copy the output.
FAQ
Is my JSON data secure?
Yes. All parsing and formatting happens directly in your browser. Your input is never transmitted to any external server.
What is the limit on JSON size?
It can comfortably handle JSON payloads up to several megabytes. Extremely large files may cause temporary UI sluggishness.
Does it support comments?
No, standard JSON (RFC 8259) does not support comments. This validator strictly adheres to the standard specifications.