JSON Formatter
Format, validate and minify JSON. Nothing is sent anywhere — it all runs in this tab.
● Your files are processed locally in your browser and are not uploaded to our servers.
How it works
KadiTools parses your JSON with the browser's built-in JSON parser, then rewrites it either indented (Format) or without whitespace (Minify). If the text isn't valid JSON, the error message tells you roughly where the parser stopped.
FAQ
Why does it say my JSON is invalid?
Usually a trailing comma, a missing quote around a key, or a comment — standard JSON doesn't allow any of those.
Does this send my data anywhere?
No. Formatting and validation happen entirely in your browser tab.