JSON Formatter & Validator
Format, validate, minify and view JSON data in a beautiful tree view.
- Fastest ResultsInstant, no waiting
- Privacy First100% local
- No LoginJust open & use
- Mobile FriendlyWorks on any device
Input (Enter or paste JSON)
Saved on this device
0 characters
Auto-updated
How to Use
- Paste or type your input in the box on the left.
- Your result appears instantly in the output panel on the right.
- Switch modes above the output to change the result.
- Click Copy or Download to save the result.
- Use Clear to reset and start over.
Examples
{"id":1,"name":"John Doe","email":"[email protected]","skills":["JavaScript","HTML","CSS"],"active":true}
{"product":"Widget","price":19.99,"tags":["new","sale"],"stock":{"warehouse":120,"store":8}}
Frequently Asked Questions
No. All formatting and validation happens entirely in your browser using JavaScript. Nothing you paste is ever sent to, stored on, or logged by any server.
Format (beautify) adds indentation and line breaks so JSON is easy to read. Minify strips all unnecessary whitespace to produce the smallest valid JSON, which is ideal for transport or storage.
There is no hard limit, but because everything runs in your browser, very large inputs (roughly over 5MB) may briefly freeze the tab while processing. For huge files a desktop tool is a better fit.
Once the page has loaded, formatting works without a network connection because the logic runs locally in your browser.
Tree View renders your JSON as a collapsible hierarchy so you can expand and explore nested objects and arrays instead of scrolling through raw text.
Yes. Every tool on DevUtilsNow is free to use with no account and no limits.