JSON Formatter & Validator

Paste messy or minified JSON to get clean, indented, readable output — or minify it back down — with live validation that flags syntax errors.

How it works

  1. Paste raw JSON into the input area.
  2. The tool validates the structure and highlights any syntax errors.
  3. Switch between pretty-print (indented) and minified views.
  4. Copy the formatted result or download it as a .json file.

Frequently asked questions

What does it do if my JSON has a syntax error?

It flags the error rather than silently failing, so you can spot problems like a missing comma or unclosed bracket before using the data elsewhere.

Does my JSON data get sent to a server?

No — formatting and validation happen entirely in your browser, so the content you paste in never leaves your device.