JSON Formatter
Beautify, minify and validate JSON with clear error messages — all in your browser, nothing uploaded.
How it works
- Paste your JSON — from an API response, a config file or anywhere.
- Beautify, minify or validate — reformat with two-space indentation, strip whitespace, or just check that it parses.
- Copy the result — or read the exact parser error if something is wrong.
Private by design
API payloads and config often contain tokens and personal data, so pasting them into a server-side formatter is risky. Here the parsing happens entirely in your browser, so your JSON never leaves your machine. This is enforced by a Content-Security-Policy that blocks the page from talking to any third-party origin. Read more in our privacy policy.
Frequently asked questions
Is my JSON uploaded to a server?
No. Formatting and validation are done in your browser with the native JSON parser. Our pages ship a Content-Security-Policy that blocks the page from sending your data anywhere — safe for pasting API responses or config that may contain secrets.
What's the difference between beautify and minify?
Beautify re-indents your JSON with two spaces so it's easy to read. Minify strips all unnecessary whitespace to produce the smallest valid JSON, which is ideal for transport or storage.
How does validation work?
The tool parses your input with the browser's JSON engine. If it's valid you get a confirmation and the formatted output; if not, it shows the parser's error message so you can find the problem.
Will it change my data?
No. Formatting only changes whitespace and key ordering as serialized — the actual values and structure are preserved exactly.
Is it free?
Completely free, with no sign-up and no limits.
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