Is my JSON secure?
Yes. Processing happens directly in your browser. No JSON data is sent to a server.
JSON Formatter - Format JSON quickly
Use the free JSON Formatter from FastOnlineTools. Simple, fast and secure directly in your browser.
Last updated: February 15, 2026
How to use
- Paste your JSON into the input field.
- Click Format for readable output.
- Click Minify for compact output.
- Use Copy to reuse the result immediately.
Features
- Formatting and minifying in one tool.
- Robust validation with clear error feedback.
- Client-side processing for privacy and speed.
Typical use cases
- Optimize code for production
- Debugging and troubleshooting
- Convert data formats
- Check encryption and security
Example
Minified JSON
{"name":"John","age":30}
Pretty JSON
{ "name": "John", "age": 30 }
Notes and limitations
- Processes data locally in browser
- No storage on servers
- Performance depends on device
Frequently Asked Questions
Why do I see an error?
The input is not valid JSON. Check commas, quotes and closing brackets.
Can I also minify?
Yes. The Minify button removes unnecessary whitespace and line breaks.