Make messy JSON readable
Paste a wall of minified or hand-edited JSON and this tool re-indents it into a clean, nested layout you can actually read. Need the opposite? Minify collapses it back to the smallest valid form for transport. And if something's broken, Validate pinpoints the error so you're not hunting for a missing comma by eye.
All parsing happens in your browser, so API responses, config files and tokens stay on your machine.
What each button does
- Beautify — re-formats with two-space indentation and line breaks for readability.
- Minify — strips all optional whitespace to produce the most compact valid JSON.
- Validate — confirms the JSON parses, or shows the exact error if it doesn't.
Common JSON mistakes it catches
Most JSON errors come from a handful of habits: a trailing comma after the last item, single quotes instead of double, unquoted keys, or a stray bracket. Because the tool uses a strict parser, it flags these immediately instead of letting them slip through.
Frequently asked questions
What does formatting JSON do?
Formatting (or beautifying) re-indents JSON with consistent spacing and line breaks so nested structure is easy to read. It does not change the data itself, only its whitespace.
How do I know if my JSON is valid?
Paste it and format or validate. If the JSON is malformed, the tool reports the error message so you can find the misplaced comma, bracket or quote that breaks it.
Is my JSON sent to a server?
No. Parsing and formatting happen entirely in your browser, so even sensitive payloads never leave your device.