What this tool does
The formatter parses your JSON using the browser's native parser, so validation matches exactly what JavaScript, APIs, and most modern services accept. If parsing fails, the error message includes the position of the problem so you can fix it quickly.
Is my data safe?
Yes. This page contains no analytics on the input and makes no network requests with your data. The JSON you paste is processed entirely in your browser's memory and disappears when you close the tab.
Common JSON errors
The most frequent issues are trailing commas after the last item in an object or array, single quotes instead of double quotes around keys and strings, and unescaped special characters inside strings. Formatting your JSON here will pinpoint all of these.