JSON Formatter & Validator
Clean and format messy JSON strings into readable indentation (2 spaces, 4 spaces, or tabs) or minify into a compact single line. Instant syntax error diagnostics with line and column pointers.
How it works
- Paste your JSON code into the editor or upload a `.json` file.
- Select formatting preference (2 spaces, 4 spaces, or minified).
- Click format or let auto-format validate your data in real time. Copy or download the formatted file.
Privacy & Processing Information
Your files and data stay on your device. All parsing and formatting executes 100% locally in your browser.
Frequently Asked Questions
Is my JSON data uploaded to any server?
No. All JSON processing is done completely in client-side JavaScript within your browser.
How do I locate syntax errors in large JSON payloads?
When a JSON parse fails, our validator highlights the exact line and character position where the error was encountered with a descriptive explanation.
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