JSON formatter
Format, minify and validate JSON with exact error location.
Paste messy JSON and get back a readable, indented version — or a minified one for production. If there is a syntax error, we show the exact line and column of the problem. Perfect for debugging API responses containing sensitive data, since nothing leaves your browser.
Frequently asked questions
Is it safe to paste production data here?
Yes. Formatting uses the browser’s native JSON.parse with zero network calls. Tokens, keys and personal data in your JSON never leave your machine.
Which errors does validation catch?
Any violation of the JSON spec: trailing commas, single quotes, unquoted keys, comments (which JSON forbids) and unclosed structures — always with the line and column of the first problem.
Does formatting change my data?
No. Formatting and minifying only change whitespace and line breaks; values, key order and types stay exactly the same.