Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
JSON Formatter pretty-prints, validates, and minifies JSON. Paste API responses or config files, fix errors quickly, and copy clean output — all offline in the browser.
How to use
Paste JSON into the editor (or load from a file if available).
Format to pretty-print, or minify for a compact payload.
Fix any validation errors highlighted by the tool.
Copy or download the result.
FAQ
Does it validate JSON?
Yes. Invalid JSON shows a clear error so you can fix commas, brackets, or quotes.
Can I minify as well as format?
Yes. Use minify when you need a smaller payload for APIs or storage.
Is my JSON sent to a server?
No. Formatting and validation run entirely in your browser.
What does JSON Formatter do?
JSON Formatter pretty-prints, validates, and minifies JSON.
How do I use JSON Formatter?
Open the JSON Formatter tool, then paste JSON into the editor (or load from a file if available).