Paste messy JSON and get it back readable and validated, or minified for production. Errors are reported with the exact position.
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JSON arrives unformatted more often than not. An API returns a single 40-kilobyte line, a log entry is copied out of a terminal, or a config file has been edited by three people with different editors. A formatter turns that into something you can actually read, with consistent indentation and one value per line.
Validation is the other half of the job. Most JSON problems are small — a trailing comma after the last array element, single quotes instead of double, a key that was never quoted at all — and they are almost impossible to spot by eye in a wall of text. Here the parser tells you the position of the problem so you can go straight to it.
The minify option does the reverse for shipping: same data, no whitespace, smaller payload. And because everything runs in your browser, you can paste a production API response containing customer records or access tokens without it ever leaving your machine — which is not true of most online JSON formatters.
If it parses, you get a formatted result and a "valid JSON" marker. If it does not, you get the browser's own parser error naming the character position where it went wrong, which is usually a trailing comma or an unquoted key.
It removes every space and line break that is not inside a string. The data is identical but the payload is smaller, which is what you want in an API response or a config shipped to browsers.
Sorting keys alphabetically makes two versions of the same object directly comparable, which turns a messy diff into a readable one. It does not change the meaning — JSON objects are unordered by definition.
Yes, within your browser's memory. Formatting runs locally, so multi-megabyte documents are handled without any upload.
No. Those are JSON5 or JSONC extensions, not valid JSON, so the parser rejects them — which is the honest answer, since most tools that consume your file will reject them too.
Never. API responses, tokens and config files are parsed in this tab and nothing is transmitted or stored.
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