Yes, completely free with no signup or usage limit.

Is my data uploaded to a server?

No. Everything runs directly in your browser.

What happens if my JSON is invalid?

You'll see a clear error message describing what's wrong instead of a formatted result.

Paste minified or messy JSON and get a readable, indented version. Processed entirely in your browser.

JSON input

: Yes, completely free with no signup or usage limit.
: No. Everything runs directly in your browser.
: You'll see a clear error message describing what's wrong instead of a formatted result.