JSON · Formatter

How to format JSON online (free)

1. Paste your JSON into the input box on the left.
2. Click Format to indent and beautify it, or Minify to strip whitespace.
3. Click Copy to grab the result. Nothing is uploaded at any point.

What does a JSON formatter do?

A JSON formatter (or "beautifier") takes compact or messy JSON and re-indents it with consistent spacing and line breaks so it's easy to read and diff. At the same time it acts as a validator: if the text isn't valid JSON, it reports the exact position of the first syntax error so you can fix it quickly.

Format vs. minify

Choose Format when you want readable JSON for debugging, code review or documentation. Choose Minify when you want the smallest possible payload — for example to embed JSON in a URL, a config value, or to reduce transfer size in an API response.

Common JSON errors

JSON is stricter than JavaScript object syntax. Keys and strings must use double quotes, there can be no trailing commas, and comments are not allowed. Numbers can't have leading zeros, and the top-level value must be an object, array, string, number, boolean or null.

Is my data private?

Yes. The entire tool runs in your browser using the built-in JSON parser. There is no upload step and no account. You can open your browser's network tab and confirm nothing is sent. It even works offline once the page has loaded.