JSON formatter

Pretty-print, minify and validate JSON in your browser — nothing leaves your machine.

Runs in your browser

No files needed100% local · no upload

Input

Mode

Output

Guide

How to convert json formatter

Paste your JSON
Paste raw JSON into the input box — compact or minified is fine.
Format or minify
Click Format for pretty indentation, or choose minify for a compact one-liner.
Copy the result
Copy the output to your clipboard.

Does it validate my JSON?

Yes — invalid JSON shows a clear error pointing at the problem so you can fix it.

Is my data sent anywhere?

No — everything runs locally in the page; nothing is transmitted.

Can I minify as well as format?

Yes — the mode selector switches between pretty-print and minify.

Keep converting

Switch text between upper, lower, title and sentence case instantly.

Count characters, words and lines in real time as you type.

Encode text to Base64 or decode it back, with full Unicode support.

Percent-encode or decode URLs and query strings safely.