Format, validate, and beautify JSON instantly
QRSwift's JSON Formatter takes raw, minified, or malformed JSON and turns it into clean, properly indented output — making it readable at a glance. It's ideal for developers debugging API responses, reviewing config files, or cleaning up data exports. The formatter also acts as a validator: if your JSON has a syntax error, it pinpoints exactly what went wrong so you can fix it fast. Everything runs in your browser with no data leaving your device.
Paste your JSON
Drop any JSON into the left panel — minified, pretty-printed, or partially broken. It doesn't need to be tidy to start.
Click Format JSON
Hit the button (or press Ctrl+Enter) to format. Valid JSON is instantly beautified with 2-space indentation.
Check for errors
If the JSON is invalid, the output panel shows the exact error message so you can track down the missing bracket or trailing comma.
Copy and use
Click Copy Output to grab the formatted JSON and paste it wherever you need it.
Yes — validation happens automatically when you click Format. The formatter parses your input using the browser's native JSON.parse(), which strictly follows the JSON spec. If parsing fails, the output panel displays the browser's error message (e.g. "Unexpected token } at position 42") so you can find and fix the problem immediately.
Just paste the minified JSON string — even if it's a single unbroken line — into the Input panel and click Format JSON. The tool will re-indent every nested key and array with 2-space indentation, adding line breaks so the structure is immediately clear. This is especially handy when inspecting API responses or minified config files.
No data ever leaves your browser. The formatting logic is plain JavaScript that runs locally on your machine — there are no API calls, no server-side processing, and no logging. This makes it safe to paste sensitive payloads such as internal API responses or configuration objects that you wouldn't want transmitted over the network.