JSON Formatter.
Format, validate, and minify JSON online. Shows errors with messages. Free, instant, no sign-up required.
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How to use
Paste your JSON into the input area.
Switch between Format (pretty-print) and Minify modes.
Errors are shown with their message — fix and reformat.
Copy or download the formatted output.
Frequently Asked Questions
What is JSON formatting?
Formatting (pretty-printing) adds indentation and line breaks to make JSON readable. Minifying removes all whitespace to reduce file size.
Why does my JSON show an error?
Common causes: trailing commas, single quotes instead of double quotes, unquoted keys, or comments (JSON does not support comments).
Is my JSON sent to a server?
No. All formatting and validation runs locally in your browser.
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