JSON Formatter and Validator

A JSON formatter, also called a JSON beautifier or pretty printer, takes compact or messy JSON and rewrites it with line breaks and indentation so people can read it. The data does not change, only the layout.

Paste your JSON into the input box, pick an indent size (2 spaces, 4 spaces or tab) and click Format. The cleaned JSON appears in the output box, ready to copy or download as a .json file.

Click Validate. The tool parses your text with a strict JSON parser. If it is valid you see a success message, and if not you get the error with its line and column so you can fix it quickly.

The usual causes are a trailing comma after the last item, single quotes instead of double quotes, keys without quotes, comments, and missing brackets or braces. Standard JSON allows none of these, so the validator reports them.

Minify removes all spaces and line breaks to make the JSON as short as possible. Use it for API payloads, config files and storage where size matters. Format it again whenever you need to read it.

Yes. Tick Sort keys before formatting and every object, including nested ones, is ordered A to Z. This makes two JSON files much easier to compare and keeps diffs small in version control.

JSON is a text format with strict rules: keys and strings use double quotes, and it cannot hold functions, comments or undefined. A JavaScript object is more flexible. If a JS object fails here, add double quotes to the keys and remove trailing commas.

No. Formatting, validating and minifying all run in your browser, so API responses, tokens in test data and private configuration are never sent or stored.

No values are changed. Only whitespace is added or removed, and keys are reordered only if you choose Sort keys. Very large integers beyond JavaScript precision can lose accuracy in any browser-based parser, so keep those as strings.

Yes, within your device memory. Files of several megabytes usually work on a computer. For huge files, work in pieces or use a command line tool such as jq.

Use the JSON to XML and CSV converter. It turns arrays and objects into XML elements or into spreadsheet rows, and you can download the result as a file.

Yes. The tool is free with no sign-up or limits and works on phones, tablets and desktops.