Is my JSON uploaded to a server?
No. Formatting and validation happen locally in your browser.
Free JSON Formatter Online
Format and minify JSON locally in your browser without sending data to a server.
Files and text are processed locally in your browser. No upload. No signup.
JSON formatting runs locally in your browser, so sensitive data stays on your device.
How to use
- 1 Paste valid JSON into the input area.
- 2 Choose whether you want formatted output or minified output.
- 3 Copy the result once it looks correct.
Features
- Format JSON with readable indentation.
- Minify JSON for transport or embedding.
- Show clear errors for invalid JSON.
- Keep all processing in your browser.
FAQ
Can I minify JSON here?
Yes. You can switch between formatted and minified output with one click.
What happens if my JSON is invalid?
The tool shows an error message and keeps your original input unchanged.