Format, validate and minify JSON. Runs entirely in your browser — nothing is uploaded.
No. This tool runs entirely in your browser using JavaScript's built-in JSON parser. Your data never leaves your device, so there's no file size limit and no daily usage limit.
It tells you exactly where the JSON is invalid — Chrome/Firefox/Safari's JSON parser reports the position of the syntax error — but it won't guess your intent and rewrite it for you.
No — it validates strict JSON per the JSON spec. Comments or trailing commas will show as a parse error; remove them before formatting.
Formatting re-indents valid JSON; if your JSON has a syntax error, the tool shows exactly where it failed instead of producing output — that’s the validation step.