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JSON Formatter, Minifier & Validator (Offline & Secure)
Free online JSON formatter and validator — paste your JSON, format with 2 or 4 space indent, minify, and detect syntax errors instantly. No data sent to any server.
How to use JSON Formatter
- Paste or type raw JSON into the left Input panel.
- Select your preferred indentation (2 spaces or 4 spaces) from the dropdown.
- Click 'Format' to pretty-print the JSON in the Output panel, or click 'Minify' to compress it.
- Real-time validation runs as you type — the status bar shows Valid (green) or Invalid (red) with exact error line.
- Click 'Copy' on the output panel to copy the result to your clipboard.
Edge Cases & Important Considerations
- Trailing commas are not valid JSON and will be flagged as a syntax error.
- Single-quoted strings are not valid JSON — use double quotes.
- Very large JSON files (50MB+) may slow down formatting due to browser memory limits.
Keyboard Shortcuts
- Ctrl/Cmd + K — Open Command Palette to switch tools instantly.
Frequently Asked Questions
Is this JSON Formatter safe for sensitive corporate data?
Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.
Can I use this tool offline?
Yes. Because this tool runs strictly on client-side JavaScript with zero external API dependencies, once loaded it functions completely offline.
100% Client-Side Privacy Guarantee
All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.