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Format and validate JSON.
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JSON Formatter validates and pretty-prints JSON as you type. Choose 2- or 4-space indentation, sort keys recursively for easy diffs, or minify JSON into a single line. Invalid JSON shows the parser’s error message (usually with the position of the problem), and the output can be copied or fed back in for another pass. Your data stays in the browser — handy for API responses that contain tokens or customer data.
Open JSON Formatter
Launch JSON Formatter directly in your browser — there is nothing to download, install, or configure first.
Paste your input
Paste or type your input into JSON Formatter to begin.
Get the formatted output
JSON Formatter processes your input instantly in the browser and shows the result, ready to copy.
Paste your JSON — if it is invalid, the formatter shows the parser’s error message, which usually points to the position of the missing comma, quote or bracket.
It orders object keys alphabetically at every level, so two documents with the same data produce identical output.
Yes. Formatting happens locally and nothing is sent to a server.
Yes. JSON Formatter is completely free, with no account, no paywall, and no usage limits.
No. JSON Formatter works instantly in any modern web browser — there is no software to install, no extension, and no sign-up.