Format, beautify, and pretty-print JSON instantly. Handles trailing commas and comments. Your data never leaves your browser.
JSON formatting, also known as pretty-printing, is the process of organizing JSON data into a readable, hierarchical structure with proper indentation and line breaks. Raw JSON is often minified (compressed) for efficiency, making it difficult for humans to read and debug.
Developers use JSON formatters to instantly beautify compressed JSON, validate syntax, identify structure issues, and understand data relationships at a glance. Whether you're working with APIs, configuration files, or data exports, a good formatter saves time and reduces errors.
Paste your minified or raw JSON into the input area. The formatter accepts any valid JSON, including malformed JSON with trailing commas and comments.
Click the "Format" button to instantly beautify your JSON with proper indentation and line breaks. Alternatively, click "Minify" to compress your JSON into a single line.
Click "Copy Result" to copy the formatted output to your clipboard. Paste it into your code, configuration file, or API request.
| Feature | json.express | Other Formatters |
|---|---|---|
| Comments & Trailing Commas | ✓ Supported | Limited or not supported |
| Privacy | ✓ 100% Client-Side | Often cloud-based, data logging |
| Speed | ✓ Instant, No Latency | Depends on server, delays possible |
| Ad-Free | ✓ No Ads | Often cluttered with ads |
| Zero Dependencies | ✓ Pure JavaScript | Often requires libraries/frameworks |
| Open Source | ✓ Yes | Varies |